If you're asking why the symbol is % - It's a contraction of 'per one hundred'. The line and two small zero's signify the number 100.
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The percent sign looks like this %. It is a forward slash that has a little circle on the top and the lower side of the dash. It is a common icon in the math world.
the at sign looks like this: @
It looks like a slanted number sign.
If you know what a stop sign looks like, then you know what an octogon looks like.
the gramatic sign of oblique how it look like