AbsInt( n )
AbsInt returns the absolute value of the integer n, i.e., n if n
is positive, -n if n is negative and 0 if n is 0 (see SignInt).
gap> AbsInt( 33 );
33
gap> AbsInt( -214378 );
214378
gap> AbsInt( 0 );
0
GAP 3.4.4