The greater than or equal to symbol is put between two numbers, where the number on the left of the symbol is "greater than or equal to" the number on the right. That just means the number to the left is either bigger than the number on the right or it's equal to, or the same as, the number to the right. This is mostly used when you don't know exactly what the number on the left is, but you know it's larger or equal to the number on the left.
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A line under the greater than symbol means, "greater than or equal to" and can also be represented by ">=" on the keyboard.
> 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
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.
In the same way that a diagonal line through the equals symbol changes equals (=) to does not equal (≠), a near-vertical line through the greater than symbol (>), changes it to not greater than. Unfortunately I cannot find it in my symbols set. One alternative, of course, is to change the equation around: x not greater than y is the same as x less than or equal to (≤) y. When inverting the equation in this fashion, you do need to remember to add = if it was not there and remove it if it was. ie not (greater than) is the same as less than or equal to not (greater than or equal to) is the same as less than not (less than) is the same as greater than or equal to not (less than or equal to) is the same as greater than
The symbol for greater than is > and the symbol for less than is <