Alt + 0174 = ®
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Usually this symbol: %
This should do it. Do it without the spaces between the characters. I add the space here because this website will show the symbol instead of the codes. & # 1 8 5 ; ¹
The square root symbol is Unicode 0x221A. To show it, you either need to draw it graphically, or you need to have a Unicode representation library.
You would use this: ┴
= (the equal sign) :)