The symbol(≠) with a slash above an equal sign(=) is called "not equal to"

The symbol (≠) with a slash above an equal sign (=) is called the "not equal to" or "inequality" symbol It indicates that the two values or expressions on either side of the symbol are not the same according to Cuemath. When you see a slanted line (also known as a slash) through any symbol, the slash cancels or negates the symbol. For example, when we see this symbol: (image source: geekalerts .com) we know that ghosts are not allowed. So, when we see a line through an equal sign, we know that it means NOT equal to. ≠ equal, not equal to. It’s easy to remember which one is which. ⩷ equals sign with two dots above and two dots below equals sign with two dots above and two dots below The sign with two dots above an equals sign (≅) typically means "is approximately equal to" or "is congruent to". The symbol is used in various contexts, but most commonly to indicate that two values or quantities are close in value, though not necessarily identical. Here's a more detailed breakdown: Approximate Equality: In mathematics and other fields, this symbol often signifies that a value is close to another, but not exactly the same. For example, 3.14 ≅ π, indicates that 3.14 is approximately equal to pi. Congruence: In geometry, ≅ is used to denote that two shapes are congruent, meaning they have the same size and shape. The symbol is distinct from the single wavy line (≈) which also means approximately equal, but ≅ often carries a stronger implication of closeness. What does an equal sign with 3 lines mean? More context fetches better answers. In logic and mathematics, the ≡ symbol can mean: “is defined as”; for example: “quadrilateral” ≡ “four-sided” “is identically equal to”; for example, an equality that is true no matter how variables are valuated “is equivalent to” (in some contexts) “is congruent to” (in modular arithmetic) For example: 36 ≡ 4(mod 8) 36 has remainder 4 when divided by 8. 1097 ≡ 252 ≡ 17 ≡ 2(mod 5) 1097, 252, 17 (and 2) have remainder 2 when divided by 5. Of course, both ⊨ and ≠ are “an equal sign with 3 lines”. I’m guessing that’s not what you meant, but additional context is always helpful.