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 "≥".
The 'greater than' sign is '>'. '<' is the 'less than' sign. If you were to say 'five is greater than 4', you could mathematically present that as '5>4'.
It is the 'equals' sign with a diagonal slash through it.
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 less than or equal to
It means greater than or equal to
I think you mean no less than which means the same as greater than which is >
> is the sign for greater than.< is the sign for less than.
The greater than or equal to sign 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 <