Did a bit of searching on Google - didn't find too much, but this is worth a quick view - 3 - simple ascii celebration of the number 3.
Of course - there is also the mobile company, formerly known in some countries as Hi3G - now simply 3, three, tre, tres, drei, ... - they have several sites, a Nordic (swedish in this case) one at Tre.se. Trying to sell airtime - or communications for that matter - with nothing but a number - to weird to catch on, or just farfetched enough to get some smiles and customers?
That's probably all for today - here in CET-land it is getting slightly late.