In certain teams the No.10 shirt, as worn by Pele, Diego Maradona and Lionel Messi, can feel a little heavier than the Dri-Fit material it's constructed from, simply because of the historical connotations of its greatest wearers. Likewise, numbers 9, 7, and 14.
But then there are the other digits, like... er, 0?
Morocco international Zerouali had a fairly unremarkable three years at Aberdeen (1999-2002), scoring 11 goals in 37 appearances, including a hat-trick against Dundee. Still, in the club shop he was the standout figure thanks to his choice of squad number.
Having been nicknamed both 'The Moroccan Magic' and 'Zero', Zerouali decided to have the latter printed on the back of his shirt – the first player in Scotland to do so – though the move proved controversial. The following season, the Scottish Premier League banned the squad digit. Tragically, 'Zero' was later killed in a car crash in 2004.