It means that you are not supposed to smoke in a certain area.
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The plus sign is used to indicate a pharmacy.And the aid sign
It has the same meaning as an equals sign anywhere else in mathematics.
You mean, like this =] ? That is one variation of a smiley-face sign. The most common kind is this: :)
flip the sign, meaning change < to > or > to <
if it has an equal sign then it is an equation