< this symbol can also mean less than
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The math symbol for "no fewer than" is typically represented by the greater than or equal to symbol, which is denoted as ≥. This symbol indicates that a value must be greater than or equal to a certain number. For example, if you see the expression x ≥ 5, it means that x must be 5 or any number greater than 5.
The inequality sign for at most is < with _ under it. ( less than or equal to)
The double tilde symbol "≈" approximately equal to
16-2
the square root symbol. that would make it 1,/2 (i don't know how to make a square root symbol, sorry) but since the numbers are next to each other it is assumed that they are being multiplied and the square root of 2 is approximately 1.414 right in between 1 and 2 :)