Break
Exits (terminates) a loop. Valid inside any kind of loop.
Break , LoopLabel
[AHK_L 59+]: If specified, LoopLabel identifies which loop this statement should apply to; either by label name or numeric nesting level. If omitted or 1, this statement applies to the innermost loop in which it is enclosed. LoopLabel must be a constant value - variables and expressions are not supported. If a label is specified, it must point directly at a loop command.
The use of Break and Continue are encouraged over goto since they usually make scripts more readable and maintainable.
Related
Continue, Loop, While-loop, For-loop, Blocks, Labels
Example
Loop { ... if var > 25 break ... if var <= 5 continue }
; Break the outer loop from within a nested loop. outer: Loop 3 { x := A_Index Loop 3 { if (x*A_Index = 6) break outer ; Equivalent to break 2 or goto break_outer. MsgBox %x%,%A_Index% } } break_outer: ; For goto.