π1 or Π1 or Pi1, may refer to:
Mathematics
edit- π1, a notation for the scalar projection onto the first component
- π1, the fundamental group of a topological space
- Π1, the fundamental groupoid of a topological space
- Π01, or Π1, a classification in the arithmetical hierarchy
Other uses
edit- Yudo π1 (Pi1), a car model
- Pi1 (gene), a gene found in Oryza sativa for fungus resistance
- Pi1, a type of torpedo warhead used by Germany in WW2; see List of World War II torpedoes of Germany
See also
edit
- Pil (disambiguation)
- PII (disambiguation)
- P1 (disambiguation) (Greek: π1; romanized "p1"; pronounced "pi1")
- Pi (disambiguation)
- π (disambiguation)
- All pages with titles containing Pi-1
- All pages with titles containing Pi1
- All pages with titles containing π1
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