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Three vertical lines: |
I will assume that you mean " to the power of two ". A symbol for any n-power is to put the number (n) on the side, above the number. Like this: nn.
The symbol for 'Less than' is '' NB The arrow head points to the right. e.g. 5 > `1
they look like arithmetic and geometric patterns in math
If you mean the symbol of a triangle, in math and science a triangle stands for change in