Re: Off-topic: @

Apologies for the second post right after the first, but it occurred
to me that Klammer-affe might be a bastardization of "Affix Klammer",
ie a (paper)clip (Klammer means clip) used for an attachment (Affix in
German).

So the etymology might be Affix Klammer -> Affenklammer -> Klammeraffe. 
As I said in the other post, a paperclip looks like an elongated @ sign.

Cheers,
-- 
Laird Breyer.