25 is an odd number.
25 is the 5th square number.
25 is the result of the Pythagorean triple 32+42 or 9+16=25.
Counting to 25 using fingers Edit
It is possible to extend standard counting system so that it can count up to 25. The matter is that when we bend first five fingers on the one hand, we bend one on another hand and unbend all on the first. Extension of this method can be used to count all the way to 1,023, using powers of 2.
In googology Edit
It can be named garfive with the gar- prefix.