≈ (often typed as "=~") means "approximately equal to"
Example: 1 ≈ 1.01
It means the figures on either side of the equal sign have equal values to each other.
It means "not equal to".
Did you mean this? ≟
It means congruent
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: ≈
Approximately equal.
It is a curvy sign
The equal sign with the slash means "is not equal to".
By 'an equal sign with a lightning bolt [through it]', do you mean '≠'? That means 'not equal to'. For example, 6≠9.
It means the figures on either side of the equal sign have equal values to each other.
yes
not equal to
It means "not equal to".
If you mean in Excel, yes: you must always start a formula with an equal sign.
It means congruent
Did you mean this? ≟
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: ≈