pound sign or hashtag
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times. as in number times number
a fligolo
There are various names for the # sign, commonly known as the number sign - similar to the musical sharp sign - one of the most common in technical senses in telephony and computing is the octothorpe.
If the number has a + sign then you add it, if it has a - sign, then you subtract it.
The radicand which is the name for the number that you are trying to solve the square root of.