That's shtrudel, as in Hebrew slang for @, generally known in English as the "at-sign". Wondering what it's called in other countries? Post editor Nancy Szokan has the scoop (or slice, as the case may be).
The source her article is based on is here.
Winkie, were you her Israeli source? Just wondering.
Update: Yes, appparently he was. And he reminds us that the official Hebrew word for the at-sign is krukheet.