Green’s Dictionary of Slang

(Aus.) a $10.00 note.

2013

T. Peacock More You Bet 66: ’$10’ as a denomination was, and is, a ‘tenner’, or in rhyming slang, a ‘Yul Brynner’; or a ‘brick’, which has been passed on from the once popular term for the sum of £10 (that is, 10 pound), and which derives from the colour of the £10 note.