It is a relatively polite way of calling someone a liar.
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Less than -79 means... Wait for it... LESS THAN -79 :O!
The less-than sign alone means "less than"; if there is a line below, it means "less than or equal".
More than or equal to.
(of an angle) more than 90° and less than 180°.
An angle less than 90 degree's.