Delta as a mathematical symbol usually means "change". It's usually used the same way in physics and chemistry, though it's sometimes used in chemical equations to represent heat.
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In chemcistry it means the 'Difference'
The symbol is called DELTA and looks like a triangle. -----> Δ <----
Not equal
The answer is an equal sign =
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.