It looks like an upside-down "T".
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Two perpendicular lines must cross at a 90 degree angle, like a plus sign: +
the at sign looks like this: @
no an addition sign is a perpendicular line segments
A plus sign (+) would be a pair of perpendicular line segments.
≈ and in case it does not show up properly on your browser, it looks like a double tilde or the equals sign wobbling up and down.