The sign (≒) with two dots above and below an equal sign typically means

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The sign (≒) with two dots above and below an equals sign typically means "approximately equal to"

but

The sign (≠) with slash above an equals sign(=) typically means "not equal to". It's used to indicate that two values or expressions are not the same.

Here's a more detailed breakdown:

"Not equal to": This is the most common interpretation of the symbol.

Context is important: While "not equal to" is the standard meaning, in some contexts, especially within specific programming languages or mathematical notations, it might have a slightly different meaning, but it generally conveys the idea of inequality.

The equal sign, represented by the symbol =, is a mathematical symbol indicating that two expressions or values are equal. It is used to show that the terms on either side of the sign have the same value or that one is equivalent to the other. In essence, it signifies that the left and right sides of the equation represent the same quantity.
For example, in the equation 2 + 2 = 4, the equal sign shows that the sum of 2 and 2 is equivalent to the number 4. Similarly, in an equation like x = 5, the equal sign indicates that the variable x has a value of 5.
The equal sign is a fundamental symbol in mathematics and is used in various contexts, including equations, expressions, and logical statements. It's a core concept in understanding relationships of equality between different mathematical entities.