Lets use an example from Thor.
Jane: Is this what you normally look like?
Thor: More or less.
So in the example somedays he wears it alot, and somedays he barely or wears it LESS than he usually does. In scientific terms it is the subject doing more than usual or less than usual
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Increase Means More.
More than or equal to.
It depends on what you mean by "more or less". If more or less is used to indicate approximately or nearly equal to, then the symbol used is ≈ which look like a wriggly equals symbol. If more or less is used for more than or less than but not equal to, then you would use an equals sign with a diagonal line through it ≠ which stands for "not equal to" You are right but if it's more than or less than it would look like this (less than)<(more) or (more than)>
It simply means that something is used less, as opposed to being used more. For instance: Filament bulbs are used less in battery torches, nowadays, as LEDs have proved more efficient.
(of an angle) more than 90° and less than 180°.