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A 'no ball' is called if a bowler has over-stepped the popping crease.
This is signalled by an arm raised at shoulder height.
There are several types of no ball.
The most common one is the foot-fault, though having the back foot wider than the return crease would also result in a no-ball.
If a bowler bowls too many intimidating deliveries in one over, he can also be no-balled.
Three short-pitched deliveries rising above the batsman's shoulders would be the right time to call a no ball.
And a full-toss above the batsman's waist is also considered a no-ball.