The number of loops that can be nested may be limited by the programming language. See loop. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.

FOR x ← 1 TO 10 FOR y ← 1 TO 10 result ← y * x OUTPUT y + " * " + x + " = " + result ENDFOR ENDFOR For every iteration of x, y is iterated ten times. Nested iteration isn't limited to FOR loops.