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.
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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 "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'.