two bob

Noun

 * 1)  Two shillings; a florin.
 * 2)  A 20-cent coin.
 * 3)  A trivially small value.

Usage notes
The use of two bob for a 20-cent coin derives from the equivalence of two shillings for 20 cents for the purpose of conversion during decimalisation (in 1966); since then, the term has slowly dropped out of usage and it is seldom used today.