Hi Gareth
Parent holds up the number 9
"Nine", says the child.
Parent holds up a 10.
"Ten", the child replies.
11.
"Pause"
From: http://www.sitepoint.com/challenge-redesigning-save-icon/
And lastly, this is highly interesting and at the same time, amusing.
http://www.hanselman.com/blog/TheFloppyDiskMeansSaveAnd14OtherOldPeopleIconsThatDontMakeSenseAnymore.aspx