The diameter.
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a circle with a diagonal line through it. it looks like = Ø =
An equal sign with a line crossed through it kinda like =\
This is a mathematical symbol meaning "does not equal", as opposed to the usual "equals" sign.
If you mean what does an o with a line over it means, it means that there is emphasis on the o. Such as, Rōb would be pronounced like Robe, not Rob. If you mean how to type it, I just searched what is an o with a line over it? in google, then copy and pasted it onto my document. Hope this helped.
The square root symbol is like a tick with a line connected to the top. Go to http://en.wikipedia.org/wiki/Square_root and the square root symbol is displayed.