This is a mathematical symbol meaning "does not equal", as opposed to the usual "equals" sign.
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An equal sign with a line crossed through it kinda like =\
The sign that represents "is not equal to", is an equals sign with a line in it, such as ≠. Therefore, you can write r≠4.
greater than is
The less-than sign alone means "less than"; if there is a line below, it means "less than or equal".
An equal sign (=) with a slash through (/) represents that two expressions are disproportional.