3 ms·

Mathematicians allow multi-character identifiers when it comes to functions, though. sin, abs, det, etc.

• Lhiw 5y ago
  Mathematicians just never left the "less characters = less typing" phase when it comes to variable names. I'm willing to bet a lot of it comes down to whiteboarding instead of writing it on a computer.
• Koshkin 5y ago
  But those are not variables.