: & \colon ¶Synopsis, one of:
: \colon
In mathematics, the colon character, :, is a relation.
With side ratios \( 3:4 \) and \( 4:5 \), the triangle is right.
Ordinary LaTeX defines \colon to produce the colon character
with the spacing appropriate for punctuation, as in set-builder notation
\{x\colon 0\leq x<1\}.
But the widely-used amsmath package defines \colon for use
in the definition of functions f\colon D\to C. So if you want
the colon character as a punctuation then use \mathpunct{:}.