Simile, try here: http://en.wikipedia.org/wiki/Number_sign
Can't use the search function to find the posts discussing the sign #.
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Sorry, ssendur, I've only just seen your post.Originally Posted by ssendur
"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?