A line under the greater than symbol means, "greater than or equal to" and can also be represented by ">=" on the keyboard.
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If by "arrow" you mean "carat" (>) the carat means "greater than" and if underlined means "greater than or equal to"
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.
The less-than sign alone means "less than"; if there is a line below, it means "less than or equal".
What symbol
"At least" is expressed with the "greater or equal" sign, for example, x >= 100. (I don't know how to draw the greater-or-equal sign here - it is a horizontal line beneath the greater sign).