Angle
From WikiManual
This calculates the angle between a bot's current co-ordinates and another location.
Place the desired co-ordinates onto the stack first then this function will remove them both and place the calculated angle onto the stack.
1000 1000 angle .aim store
This will store the angle between where a bot is currently and the target co-ordinates, [1000,1000], into aim.
A use for this in combat is to calculate the exact angle required to aim at an enemy. The code:
*.refxpos *.refypos angle .aim store
Will enable amazingly percise attacks.