Since every iTunes page has a lot of text we had to make a discount announce more noteworthy. At this moment I reminded about UNICODE symbols. People use checks ??, arrows ? ? ? and more seldom numbers ?????????? to emphasize the importance of their points. Apple doesn't really prohibit it :)
Out short marketing text looked like:?? 66% WEEKEND DISCOUNT ??
I'd not keep this aggressive symbols forever, but I believe it did the job.
Check out original table of ornament symbols here.

Dingbats were added to the Unicode Standard in June, 1993 with the release of version 1.1.

The Unicode block for Dingbats is U+2700–U+27BF:

Dingbats[1]
Unicode.org chart (PDF)
0 1 2 3 4 5 6 7 8 9 A B C D E F
U+270x ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
U+271x ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
U+272x ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
U+273x ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
U+274x ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
U+275x ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
U+276x ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
U+277x ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
U+278x ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
U+279x ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
U+27Ax ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
U+27Bx ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
Notes
1.^ As of Unicode version 6.0