It means greater/less than or equal to. For instance x>3 could be any number greater than 3, but not 3. With the underline, it could be any number greater than or including 3.
If by "arrow" you mean "carat" (>) the carat means "greater than" and if underlined means "greater 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.
It means less than or equal to
The greater than or equal to sign is "≥".
greater than is > and less than is <
> greater than < less than > greater than or equal to (underlined) -- < less than or equal to (also underlined) --
If by "arrow" you mean "carat" (>) the carat means "greater than" and if underlined means "greater 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.
They mean that the expression to the left of the sign is greater than or less than (as appropriate) the expression to the right of the sign.
It means greater than or equal to
It means less than or equal to
> is the sign for greater than.< is the sign for less than.
The greater than or equal to sign is "≥".
I think you mean no less than which means the same as greater than which is >
Less than sign is < Greater than sign is >
The greater than sign is ">" and the less than sign is "<"
the less than sign is > the greater than sign is <