The opposite of less than or equal to is greater than or equal.
And also:
The opposite of greater than or equal to is less than or equal.
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The less than sign I believe that you are talking about is the minus/subtraction sign? The addition sign, +, is the opposite of the subtraction sign :)
An inequality must have a greater than sign (>) OR a less than sign (<) OR a greater than or equal to sign (≥) OR a less than or equal to sign (≤).
Greater than >Less than written on top of =.
It means less than or equal to
The "underlined" less than sign is actually a sign meaning "less than or equal to" and it is the equal to part which looks like an underline.