angle

#​define ANG45 0x20000000
#​define ANG90 0x40000000
#​define ANG180 0x80000000
#​define ANG270 0xc0000000
 
Like angles, that you might want 0-360, without ever seeing negatives, or numbers bigger than 360, they used unsigned.
 
It actually makes sense.
As does -angle.