How to Sign "Don't touch?" for Daycare Children?

Hi! I love using signs to facilitate language in little ones (plus I've used it in an Early Childhood environment with special ed. kids as well). They seem to respond more quickly when words are coupled with signs.

Anyway, I run my own family daycare, and I watch a couple of little ones under 2, and I use the words "Don't touch," at least a couple of times a week (if not in a day!), but I can't find a sign for it. I've found "don't," but not touch. Could you tell me how to do it?

Thanks so much!