UK - Fifty pence (50p).

Half a pound Sterling (100 pence).

Fifty Pennies.

From pre-decimal currency 'bob' = shilling and 20 shillings made one British pound. Therefore a modern 50p piece ('bit') = 10 Bob.

Since the shilling was phased out of British currency, "ten bob" has now come to mean ten ponuds, i.e. one bob is one pound, and so on.