What is the English word for the sign "#"?

[simile]

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[Casiopea]

Simile, try here: http://en.wikipedia.org/wiki/Number_sign

[MrPedantic]

Originally Posted by ssendur

ok i wonder if this sentence correct mrpedantic " it is required not to do that"
would you use that for your own way of speech as a native speaker, or what would you suggest instead of that

Sorry, ssendur, I've only just seen your post.

"It is required not to do that."

No, I don't think I would do that.

Maybe, depending on context:

"You must not do that."
"Doing that is not permitted."
"It is not permitted to do that."

There are other variants too.

Do you have a particular context?

MrP