What is the meaning of cap in cap plan?

This is an extract from a Melbourne Age article Rather than pay for each call and SMS the usual way, these plans mean users only pay a certain amount per month (the "cap") if their usage doesn't...

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A success or achievement that may help you in the future is a feather in your cap. Back in the time where wearing hats was common etiquette one would often see a man with a feather in his cap. This...

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Top if cap to bottle and hat if a head cap