Parameters

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1 or name Line number
if left blank: {{Hanoi Metro Line Symbol|}} =
optional
2 or size Size (px); default value is 20
if left blank then it will return with expression errors.
optional (should not be blank)

Usage

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Code Result
{{HMLS|name=3}} T3
{{HMLS|2A}} [[Hanoi Metro Line 2A|Line 2A]] T2A Line 2A
{{HMLS|2|size=40}} T2
[[Hanoi Metro Line 5|{{HMLS|5|size=25}}]] T5