NY Times Monday crossword? "radical sign"
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Radical Sign
it means square root. Ö9 = 3
The symbol is §
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.
Answer: = The symbol for Similarity is the Tilde, ~. It is NOT the equal symbol, =.