≈ (often typed as "=~") means "approximately equal to"
Example: 1 ≈ 1.01
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It means the figures on either side of the equal sign have equal values to each other.
It means "not equal to".
Not sure how to type the Alt code, but you can copy/paste it from here or from various websites which list them. A couple of related links are below. Here you can copy it: ≈
Did you mean this? ≟
It means congruent