It means that the number or expression on the left of the symbol is less that the value or expression to the right, or that they are equal.
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the symbol for less than is "<" while the symbol for less than or equal to is "<" with "_" underneath it.
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)>
> is greater than; with a line under it it is greater than or equal to < is less than; with a line under it it is less than or equal to
It means that is is less than or equal to that number.
If a is not less than b then a is greater than or equal to b. The symbol for "greater than or equal to " is > with a bar under it -- a combination of the equal sign (=) and the greater than sign (>). In many computer languages you can use >= with no space between for this relation.