In mathematics, the symbol ≤ means between.

However, for general purposes I don't think using < or - is a problem.

Heck you could possibly consider a tilde, ~. Tilde means "approximately".

In mathematics, the symbol ≤ can mean between.

a ≤ x ≤ d -- x must between a and d possibly including either a or d

So... ≤ 2014 perhaps

However, for general purposes I don't think using < or - is a problem.

Heck you could possibly consider a tilde, ~. Tilde means "approximately".