What's the difference of the fonts starting with @ symbol?

Question

I'm using PowerBuilder 12.5 since it is released. Today I realized that there are font names (in the dropdown list which appears when Datawindow Painter is opened) starting with an @ symbol. There is about thirty of them and the same font names without @ already exist in the same list.
(i.e. @Arial Unicode MS and Arial Unicode MS).

The question is what is the difference between those?

Answer 1

I've also asked this question on forum.sybase.com newsgroups under sybase.public.powerbuilder.general and seems like the best answer is that @ fonts are for 90° rotated vertical text.

Thanks to Roland Smith [TeamSybase] and Reed Shilts [Sybase].