Indian numbering system

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The Indian numbering system is used in the Indian subcontinent (Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan, Sri Lanka) to express large numbers. The terms lakh or 1,00,000 (one hundred thousand, written as 100,000 in Pakistan and outside the subcontinent) and crore or 1,00,00,000^[1] (ten million, written as 10,000,000 outside the subcontinent) are the most commonly used terms in Indian English to express large numbers in the system.

Comparison with Western system

The Indian numbering system corresponds to the Western system for the zeroth through fourth powers of ten: one (10⁰), ten (10¹), one hundred (10²), one thousand (10³), and ten thousand (10⁴). For higher powers of ten, the names no longer correspond. In the ancient Indian system still in use in regional languages of India, there are words for (10⁶²). These names respectively starting at 1000 are sahasra, ayuta, laksha, niyuta, koti, arbhudha, abhja, karva, nikarva, mahapadma, shanmkhu, jaladhi, amtya, madhya, paraardha. In the Indian system now prevalent in the northern parts,^{[clarification needed]} the next powers of ten are called one lakh, ten lakh, one crore, ten crore, one arab (or one hundred crore), and so on; there are new words for every second power of ten (10^{5 + 2n}): lakh (10⁵), crore (10⁷), arab (10⁹), kharab (10¹¹), etc. In the Western system, the next powers of ten are called one hundred thousand, one million, ten million, one hundred million, one billion (short scale)/one thousand million (long scale), and so on; in the short scale, there are new words for every third power of ten (10³ⁿ): million (10⁶), billion (10⁹), trillion (10¹²), etc.

Written numbers differ in the placement of commas, grouping digits into powers of one hundred (10²) in the Indian system (except for the first thousand), and into powers of one thousand (10³) in the Western system. The Indian and most English systems both use the decimal point and the comma digit-separator, while other languages and countries using the Western numbering system use the decimal comma and the thin space or point to group digits.^[2]

There are terms for numbers larger than 1 crore as well, but these are not commonly used. These include 1 arab (equal to 100 crore or 1 billion (short scale)), 1 kharab (equal to 100 arab or 100 billion (short scale)), 1 nil (sometimes transliterated as neel; equal to 100 kharab or 10 trillion), 1 padma (equal to 100 nil or 1 quadrillion), 1 shankh (equal to 100 padma or 100 quadrillion), and 1 mahashankh (equal to 100 shankh or 10 quintillion). In common parlance, the thousand, lakh, and crore terminology (though inconsistent) repeats for larger numbers: thus 1,000,000,000,000 (one trillion) becomes 1 lakh crore, written as 10,00,00,00,00,000.

Examples

lakh: 150,000 rupees in India is referred to as "1.5 lakh rupees", which is written as 1,50,000 rupees;
crore: 30,000,000 (thirty million) rupees is referred to as "3 crore rupees", which is written as 3,00,00,000 rupees with commas at the thousand, lakh, and crore places.

Pronunciation in English

When speakers of indigenous Indian languages are speaking English, the pronunciations may be closer to their mother tongue; e.g. "lakh" and "crore" might be pronounced /lɑkʰ/, /kɑrɔːr/, respectively.

lakh /læk/
crore /krɔː(ɹ̠)/
arab /æˈɹ̠æb/
kharab /kʰæˈɹ̠æb/

Use of separators

The Indian numbering system uses separators differently from the international norm. Instead of grouping digits by threes as in the international system, the Indian numbering system groups the rightmost three digits together (until the hundreds place), and thereafter groups by sets of two digits.^[3] One trillion would thus be written as 10,00,00,00,00,000 or 10 kharab (or one lakh crore). This makes the number convenient to read using the system's terminology. For example:

Indian system	Indian system (words)	International system	International system (words)
5,00,000	Five lakh	500,000	Five hundred thousand
12,34,56,789	Twelve crore, thirty-four lakh, fifty-six hazar, seven hundred, and eighty-nine	123,456,789	One hundred and twenty-three million, four hundred and fifty-six thousand, seven hundred and eighty-nine
17,00,00,00,000	Seventeen arab	17,000,000,000	Seventeen billion (short scale)
6,78,90,00,00,00,00,000	Six padma, seventy-eight nil, and ninety kharab	6,789,000,000,000,000	Six quadrillion, seven hundred and eighty-nine trillion

This accords with the Indian numbering system, which has units for thousands, hundreds of thousands, tens of millions, etc.

Names of numbers

The table below follows the short scale usage of one billion being one thousand million. In India, Pakistan, Bangladesh, and Sri Lanka, following former British usage, the long scale was used, with one billion equivalent to one million million.

Names of numbers
Indian English	Hindustani Hindi / Urdu	Marathi	Bengali	Odia	Nepali	Tamil	Telugu	Kannada	Malayalam	Indian notation	Power notation	International notation^[4]	Short scale Western (long scale Western)
One	एक / ایک (ēk)	एक (ēk)	এক (êk)	ଏକ (ekå)	एक (ēk)	ஒன்று (oṉṟu)	ఒకటి (okaṭi)	ಒಂದು (ಬಿಡಿ) (ondu)	ഒന്ന് (onn)	1	10⁰	1	One
Ten	दस / دس (das)	दहा (dahā)	দশ (dôś)	ଦଶ (dåśå)	दश (daś)	பத்து (pattu)	పది (padi)	ಹತ್ತು (hattu)	പത്ത് (patt)	10	10¹	10	Ten SI prefix: deca-
One hundred	सौ / سو (sau)	शंभर (śambhar)	শত (śato)	ଶହେ (śåhe)	सय (saya)	நூறு (nūṟu)	వంద/నూరు (vanda/nūru)	ನೂರು (nūru)	നൂറ് (nuṟ)	100	10²	100	One hundred SI prefix: hecto-
One thousand	हज़ार / ہزار (hazār)	एक हजार (ēk hajār)	হাজার (hāzār)	ହଜାର (håjārå) ସହସ୍ର (såhåsrå)	एक हजार (ēk hajār)	ஆயிரம் (āyiram)	వెయ్యి (veyyi)	ಸಾವಿರ (sāvira)	ആയിരം (āyiraṁ)	1,000	10³	1,000	One thousand SI prefix: kilo-
Ten thousand	दस हज़ार / دس ہزار (das hazār)	दहा हजार (dahā hajār)	অযুত (ōjut) দশ হাজার (dôś hāzār)	ଦଶ ହଜାର (dåśå håjārå) ଅୟୁତ (åyutå)	दश हजार (daś hajār)	பத்தாயிரம் (pattāyiram) ஆயுதம் (āyutam)	పది వేలు (padi vēlu)	ಹತ್ತು ಸಾವಿರ (ಅಯುತ) (hattu sāvira)	പതിനായിരം (patināyiraṁ)	10,000	10⁴	10,000	Ten thousand
One lakh	लाख / لاکھ (lākh)	एक लाख (ēk lākh)	লক্ষ (lôkkhō) লাখ (lākh)	ଲକ୍ଷ (låkṣå)	एक लाख (ēk lākh)	இலட்சம் (ilaṭcam) நியுதம் (niyutam)	లక్ష (lakṣa)	ಲಕ್ಷ (lakṣa)	ലക്ഷം (lakṣaṁ)	1,00,000	10⁵	100,000	One hundred thousand
Ten lakh	दस लाख / دس لاکھ (das lākh)	दहा लाख (dahā lākh)	নিযুত (nijut) দশ লাখ (dôś lākh)	ଦଶ ଲକ୍ଷ (dåśå låkṣå) ନିୟୁତ (niyutå)	दश लाख (daś lākh)	பத்து இலட்சம் (pattu ilaṭcam)	పది లక్షలు (padi lakṣalu)	ಹತ್ತು ಲಕ್ಷ (ನಿಯುತ) (hattu lakṣa)	പത്തുലക്ഷം (pattulakṣaṁ)	10,00,000	10⁶	1,000,000	One million SI prefix: mega-
One crore	करोड़ / کروڑ (karōṛ)	एक कोटी (ēk kōṭī)	কোটি (kōṭi)	କୋଟି (koṭi)	एक करोड (ēk karoḍ)	கோடி (kōṭi)	కోటి (kōṭi)	ಕೋಟಿ (kōṭi)	കോടി (kōṭi)	1,00,00,000	10⁷	10,000,000	Ten million
Ten crore	दस करोड़ / دس کروڑ (das karōṛ)	दहा कोटी (dahā kōṭī)	অর্বুদ (ōrbud) দশ কোটি (dôś kōṭi)	ଦଶ କୋଟି (dåśå koṭi) ଅର୍ବୁଦ (årbudå)	दश करोड (daś karoḍ)	அற்புதம் (aṟputam)	పది కోట్లు (padi kōṭlu)	ಹತ್ತು ಕೋಟಿ (ಅರ್ಭುಧ) (hattu kōṭi)	പത്തുകോടി (pattukōṭi)	10,00,00,000	10⁸	100,000,000	One hundred million
One arab / one hundred crore	अरब / ارب (arab) सौ करोड़ / سو کروڑ (sau karōṛ)	एक अब्ज (ēk abja)	মহার্বুদ (môhārbud) একশ কোটি (êkśō kōṭi)	ଶହେ କୋଟି (śåhe koṭi) ବୃନ୍ଦ (brundå)	एक अर्ब (ēk arba)	நிகற்புதம் (nikaṟputam)	వంద కోట్లు (vanda kōṭlu)	ನೂರು ಕೋಟಿ (ಅಭ್ಜ) (nūru kōṭi)	നൂറുകോടി (nūṟukōṭi)	1,00,00,00,000	10⁹	1,000,000,000	One billion (one milliard) SI prefix: giga-
Ten arab / one thousand crore	दस अरब / دس ارب (das arab) एक हज़ार करोड़ / ایک ہزار کروڑ (ēk hazār karōṛ)	एक खर्व (ek kharva)	খর্ব (khôrbō) হাজার কোটি (hāzār kōṭi)	ହଜାର କୋଟି (håjārå koṭi) ଖର୍ବ (khårbå)	दश अर्ब (daś arba)	கும்பம் (kumpam)	వెయ్యి కోట్లు (veyyi kōṭlu)	ಒಂದು ಸಾವಿರ ಕೋಟಿ (ಕರ್ವ) (ondu sāvira kōṭi)	ആയിരം കോടി (āyiraṁ kōṭi)	10,00,00,00,000	10¹⁰	10,000,000,000	Ten billion (ten milliard)
One kharab / one hundred arab / ten thousand crore	खरब / کھرب (kharab)	एक निखर्व (ek nikharva)	মহাখর্ব (môhākhôrbō) দশ হাজার কোটি (dôś hājār kōṭi)	ଦଶ ହଜାର କୋଟି (dåśå håjārå koṭi) ନିଖର୍ବ (nikhårbå)	एक खर्ब (ēk kharba)	கணம் (kaṇam)	పది వేల కోట్లు (padi vēla kōṭlu)	ಹತ್ತು ಸಾವಿರ ಕೋಟಿ (ನಿಕರ್ವ) (hattu sāvira kōṭi)	പതിനായിരം കോടി (patināyiraṁ kōṭi)	1,00,00,00,00,000	10¹¹	100,000,000,000	One hundred billion (one hundred milliard)
Ten kharab / one thousand arab / one lakh crore	दस खरब / دس کھرب (das kharab) एक लाख करोड़ / ایک لاکھ کروڑ (ēk lākh karōṛ)	एक पद्म (ēk padma)	শঙ্খ (śôṅkhō) লাখ কোটি (lākh kōṭi)	ଲକ୍ଷ କୋଟି (låkṣå koṭi) ଶଙ୍ଖ (śåṅkhå)	दश खर्ब (daś kharba)	கற்பம் (kaṟpam)	లక్ష కోట్లు (lakṣa kōṭlu)	ಒಂದು ಲಕ್ಷ ಕೋಟಿ (ಮಹಾಪದ್ಮ) (ondu lakṣa kōṭi)	ഒരു ലക്ഷം കോടി (oru lakṣaṁ kōṭi)	10,00,00,00,00,000	10¹²	1,000,000,000,000	One trillion (one thoubillion) SI prefix: tera-
One nil / one hundred kharab / ten thousand arab / ten lakh crore	नील / نیل (nīl)	एक महापद्म (ek mahāpadma)	মহাশঙ্খ (môhāśôṅkhō) দশ লাখ কোটি (dôś lākh kōṭi)	ଦଶ ଲକ୍ଷ କୋଟି (dåśå låkṣå koṭi) ପଦ୍ମ (pådmå)	नील (nīl)	நிகற்பம் (nikaṟpam)	పది లక్షల కోట్లు (padi lakṣala kōṭlu)	ಹತ್ತು ಲಕ್ಷ ಕೋಟಿ (ಶಂಖು) (hattu lakṣa kōṭi)	പത്തുലക്ഷം കോടി (pattulakṣaṁ kōṭi)	1,00,00,00,00,00,000	10¹³	10,000,000,000,000	Ten trillion (ten billion)
Ten nil / one crore crore	दस नील / دس نیل (das nīl) एक करोड़ करोड़ / ایک کروڑ کروڑ (ēk karōṛ karōṛ)	एक शंखू (ēk śaṅkhū)	পদ্ম (pôddō) একশ লাখ কোটি (êkśō lākh kōṭi) শতলক্ষ কোটি (śôtôkōṭi lôkkō)f	ଶହେ ଲକ୍ଷ କୋଟି (śåhe låkṣå koṭi) ସାଗର (sāgårå)	दश नील (daś nīl)	பதுமம் (patumam)	కోటి కోట్లు (kōṭi kōṭlu)	ಒಂದು ಕೋಟಿ ಕೋಟಿ (ಜಲಧಿ) (ondu kōṭi kōṭi)	നൂറ് ലക്ഷം കോടി (nuṟ lakṣaṁ kōṭi)	10,00,00,00,00,00,000	10¹⁴	100,000,000,000,000	One hundred trillion (one hundred billion)
One padma / one hundred nil / ten crore crore	पद्म / پدم (padma)	एक जलधि शंखू (eka jaladhi śaṅkhū)	মহাপদ্ম (môhāpôddō) হাজার লাখ কোটি (hāzār lākh kōṭi)	ହଜାର ଲକ୍ଷ କୋଟି (håjārå låkṣå koṭi) ଅନ୍ତ୍ୟ (åntyå)	पद्म (padma)	சங்கம் (caṅkam)	పది కోట్ల కోట్లు (padi kōṭla kōṭlu)	ಹತ್ತು ಕೋಟಿ ಕೋಟಿ (ಅಂತ್ಯ) (hattu kōṭi kōṭi)	ആയിരം ലക്ഷം കോടി (āyiraṁ lakṣaṁ kōṭi)	100,00,00,00,00,00,000	10¹⁵	1,000,000,000,000,000	One quadrillion (one billiard) SI prefix: peta-
Ten padma / one hundred crore crore	दस पद्म / دس پدم (das padma)	एक अंत्य (eka antya)	বঙ্গ (bongo)দশ হাজার লাখ কোটি (dôś hāzār lākh kōṭi)	ଦଶ ହଜାର ଲକ୍ଷ କୋଟି (dåśå håjārå låkṣå koṭi) ମଧ୍ୟ (mådhyå)	दश पद्म (daś padma)	வெள்ளம் (veḷḷam) சமுத்திரம் (camuttiram)	వంద కోట్ల కోట్లు (vanda kōṭla kōṭlu)	ನೂರು ಕೋಟಿ ಕೋಟಿ (ಮಧ್ಯ) (nūru kōṭi kōṭi)	പതിനായിരം ലക്ഷം കോടി (patināyiraṁ lakṣaṁ kōṭi)	10,00,00,00,00,00,00,000	10¹⁶	10,000,000,000,000,000	Ten quadrillion (ten billiard)
One shankh / one hundred padma / one thousand crore crore / one lakh lakh crore	शंख / شنکھ (śaṅkh)	एक परार्ध (eka parārdha)	মহাবঙ্গ (mohabongo)শত হাজার লাখ কোটি (śoto hāzār lākh kōṭi)	ଶହେ ହଜାର ଲକ୍ଷ କୋଟି (śåhe håjārå låkṣå koṭi) ପରାର୍ଦ୍ଧ (pårārddhå)	शंख (śaṅkha)	அந்நியம் (anniyam)	వెయ్యి కోట్ల కోట్లు (veyyi kōṭla kōṭlu)	ಒಂದು ಸಾವಿರ ಕೋಟಿ ಕೋಟಿ (ಪರಾರ್ಧ) (ondu sāvira kōṭi kōṭi)	ലക്ഷം ലക്ഷം കോടി (lakṣaṁ lakṣaṁ kōṭi)	100,00,00,00,00,00,00,000	10¹⁷	100,000,000,000,000,000	One hundred quadrillion (one hundred billiard)
Ten shankh / ten thousand crore crore	दस शंख / دس شنکھ (das śaṅkh) गुलशन / گلشن (gulśan)	एक महापरार्ध (eka mahāparārdha)	গুলশান (gulśān) দশ শত হাজার লাখ কোটি (doś śoto hāzār lākh kōṭi)	ଦଶ ଶହେ ହଜାର ଲକ୍ଷ କୋଟି (dåśå śåhe håjārå låkṣå koṭi) ଦଶ ପରାର୍ଦ୍ଧ (dåśå pårārddhå)	दश शंख (daś śaṅkha)	அர்த்தம் (arttam)	పది వేల కోట్ల కోట్లు (padi vēla kōṭla kōṭlu)	ಹತ್ತು ಸಾವಿರ ಕೋಟಿ ಕೋಟಿ (hattu sāvira kōṭi kōṭi)	പത്തുലക്ഷം ലക്ഷം കോടി (pattulakṣaṁ lakṣaṁ kōṭi)	10,00,00,00,00,00,00,00,000	10¹⁸	1,000,000,000,000,000,000	One quintillion (one trillion) SI prefix: exa-

Historic numbering systems

Numbering systems in Hindu epics

There are various systems of numeration found in various ancient epic literature of India (itihasas). The following table gives one such system used in the Valmiki Ramayana.^[5]

Name	Indian notation	Power notation	Indian system	Short scale Western
एक (ēka)	0,00,001	10⁰	One	One
दश (daśa)	0,00,010	10¹	Ten	Ten
शत (śata)	0,00,100	10²	One hundred	One hundred
सहस्र (sahasra)	0,01,000	10³	One thousand	One thousand
लक्ष (lakṣa)	1,00,000	10⁵	One lakh	One hundred thousand
कोटि (kōṭi)	1,00,00,000	10⁷	One crore	Ten million
शङ्कु (śaṅku)	1,00,000 koṭi	10¹²	Ten kharab or One lakh crore	One trillion
महाशङ्कु (mahāśaṅku)	1,00,000 śaṅku	10¹⁷	One shankh or One thousand crore crore	One hundred quadrillion
वृन्द (vr̥nda)	1,00,000 mahāśaṅku	10²²		Ten sextillion
महावृन्द (mahāvr̥nda)	1,00,000 vr̥nda	10²⁷		One octillion
पद्म (padma)	1,00,000 mahāvr̥nda	10³²		One hundred nonillion
महापद्म (mahāpadma)	1,00,000 padma	10³⁷		Ten undecillion
खर्व (kharva)	1,00,000 mahāpadma	10⁴²		One tredecillion
महाखर्व (mahākharva)	1,00,000 kharva	10⁴⁷		One hundred quattuordecillion
समुद्र (samudra)	1,00,000 mahākharva	10⁵²		Ten sexdecillion
ओघ (ogha)	1,00,000 samudra	10⁵⁷		One octodecillion
महौघ (mahaugha)	1,00,000 ogha	10⁶²		One hundred novemdecillion

Other numbering systems

The denominations by which land was measured in the Kumaon Kingdom were based on arable lands and thus followed an approximate system with local variations. The most common of these was a vigesimal (base-20) numbering system with the main denomination called a bisi (see Hindustani number bīs), which corresponded to the land required to sow 20 nalis of seed. Consequently, its actual land measure varied based on the quality of the soil.^[6] This system became the established norm in Kumaon by 1891.^[7]

Usage in different languages

Below is a list of translations for the words lakh and crore in other languages spoken in the Indian subcontinent:

In Assamese, a lakh is also called লক্ষ lokhyo, or লাখ lakh and a crore is called কৌটি বা কোটি kouti
In Bengali, a lakh is natively (tadbhava) known as লাখ lākh, though some use the ardha-tatsama লক্ষ lokkho. A crore is called কোটি kōṭi
In Burmese, crore is called ကုဋေ [ɡədè]. Lakh is used in Burmese English.
In Dhivehi, a lakh is called ލައްކަ la'kha and a crore is called ކްރޯރް kroaru
In Gujarati, a lakh is called લાખ lākh and a crore is called કરોડ karoḍ. A hundred crore is called અબજ abaj
In Hindi, a lakh is called लाख lākh and a crore is called करोड karoḍ. A hundred crore is called अरब arab
In Kannada, a lakh is called ಲಕ್ಷ lakṣha and a crore is called ಕೋಟಿ kōṭi
In Khasi, a lakh is called lak and a crore is called klur or krur. A billion is called arab and hundred billion is called kharab.
In Malayalam, a lakh is called ലക്ഷം laksham and a crore is called കോടി kodi.
In Marathi, a lakh is called लाख/लक्ष lākh and a crore is called कोटी koṭi or करोड karoḍ, and an arab (10⁹) is called अब्ज abja.
In Nepali, a lakh is called लाख lākh and a crore is called करोड karoḍ.
In Odia, a lakh is called ଲକ୍ଷ lôkhyô and a crore is called କୋଟି koṭi.
In Punjabi, a lakh is called lakkh (Shahmukhi: لکھ, Gurmukhi: ਲੱਖ) and a crore is called karoṛ (Shahmukhi: کروڑ, Gurmukhi: ਕਰੋੜ).
In Rohingya, a lakh is called lák and a crore is called kurul. A thousand crore is called kuthí.
In Sinhala, a lakh is called ලක්ෂ lakṣa and a crore is called කෝටි kōṭi.
In Tamil, a lakh is called இலட்சம் ilaṭcam and a crore is called கோடி kōṭi.
In Telugu, a lakh is called లక్ష lakṣha and a crore is called కోటి kōṭi.
In Urdu, a lakh is called لاکھ lākh and a crore is called کروڑ karoṛ. A billion is called arab (ارب), and one hundred billion/arab is called a kharab (کھرب).
Lakh has entered the Swahili language as "laki" and is in common use.

Formal written publications in English in India tend to use lakh/crore for Indian currency and International numbering for foreign currencies.^[8]

Current usage

The usage of this system is limited to the nations of Nepal, India, Pakistan, Bangladesh, and Myanmar. It is universally employed within these countries, and is preferred to the English numbering system.^[9]

Sri Lanka used this system in the past but has switched to the English numbering system in recent years.

In the Maldives, the term lakh is widely used in official documents and local speech. However, the Westernised Hindu-Arabic numeral system is preferred for higher denominations (such as millions).

Most institutions and citizens in India use the Indian number system. The Reserve Bank of India was noted as a rare exception in 2015,^[10] whereas by 2024 the Indian system was used for amounts in rupees and the Western system for foreign currencies throughout the Reserve Bank's website.^[11]

References

^ "Knowing our Numbers". Department Of School Education And Literacy. National Repository of Open Educational Resources. Archived from the original on 16 February 2016. Retrieved 13 February 2016.
^ "Decimal and Thousands Separators (International Language Environments Guide)". docs.oracle.com. Retrieved 29 April 2021.
^ Emmons, John (25 March 2018). "UNICODE LOCALE DATA MARKUP LANGUAGE (LDML) PART 3: NUMBERS". Unicode.org. Archived from the original on 25 July 2018. Retrieved 25 March 2018.
^ Use of separator in digit grouping here follows customs in most English-speaking countries. For international standards and details, see decimal mark.
^ "Valmiki Ramayana - Yuddha Kanda, Chapter (Sarga) 28,(Verses 33 – 38)". Retrieved 15 July 2021.
^ Traill, G.W. (1828). Batten, J.H. (ed.). Statistical Sketch of Kamaon. John Murray. p. 34.
^ "North Indian Notes and Queries". Google Books. 1–3. Pioneer Press: 216. 1891.
^ Shapiro, Richard (16 August 2012). "The most distinctive counting system in English? Indian cardinal numbers". Oxford English Dictionary. Archived from the original on 30 June 2020. Retrieved 24 May 2020. Shapiro is/was an OED employee. The article states: "The opinions and other information contained in the OED blog posts and comments do not necessarily reflect the opinions or positions of Oxford University Press."
^ Krulwich, Robert; Block, Ezra (21 October 2010). "Hey! Who Can Explain What India Does With Its Commas? (Not Commies. Commas.)". NPR. Retrieved 3 August 2020.
^ Gurpur (10 August 2015). "Can we follow Indian numbering system for simplicity and good order?". Moneylife News & Views. Retrieved 3 September 2020.
^ Reserve Bank of India, old and new website (known on archive.org since 5 Apr 2024). Retrieved 16 Apr 2024.

[nroer-1] "Knowing our Numbers". Department Of School Education And Literacy. National Repository of Open Educational Resources. Archived from the original on 16 February 2016. Retrieved 13 February 2016.

[2] "Decimal and Thousands Separators (International Language Environments Guide)". docs.oracle.com. Retrieved 29 April 2021.

[3] Emmons, John (25 March 2018). "UNICODE LOCALE DATA MARKUP LANGUAGE (LDML) PART 3: NUMBERS". Unicode.org. Archived from the original on 25 July 2018. Retrieved 25 March 2018.

[4] Use of separator in digit grouping here follows customs in most English-speaking countries. For international standards and details, see decimal mark.

[5] "Valmiki Ramayana - Yuddha Kanda, Chapter (Sarga) 28,(Verses 33 – 38)". Retrieved 15 July 2021.

[6] Traill, G.W. (1828). Batten, J.H. (ed.). Statistical Sketch of Kamaon. John Murray. p. 34.

[7] "North Indian Notes and Queries". Google Books. 1–3. Pioneer Press: 216. 1891.

[8] Shapiro, Richard (16 August 2012). "The most distinctive counting system in English? Indian cardinal numbers". Oxford English Dictionary. Archived from the original on 30 June 2020. Retrieved 24 May 2020. Shapiro is/was an OED employee. The article states: "The opinions and other information contained in the OED blog posts and comments do not necessarily reflect the opinions or positions of Oxford University Press."

[9] Krulwich, Robert; Block, Ezra (21 October 2010). "Hey! Who Can Explain What India Does With Its Commas? (Not Commies. Commas.)". NPR. Retrieved 3 August 2020.

[10] Gurpur (10 August 2015). "Can we follow Indian numbering system for simplicity and good order?". Moneylife News & Views. Retrieved 3 September 2020.

[11] Reserve Bank of India, old and new website (known on archive.org since 5 Apr 2024). Retrieved 16 Apr 2024.

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