A line under the greater than symbol means, "greater than or equal to" and can also be represented by ">=" on the keyboard.
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).
Not greater than or equal to.
Low tire pressure symbol. Adjust pressure and allow to reset after driving a few miles.
Accenture
It means greater than or equal to
All things that are underneath the sun or anything in earth is useless and boastful not knowing that there is a Creator greater than them.
It's an "i" with a line between it. It stands for "one".
If by "arrow" you mean "carat" (>) the carat means "greater than" and if underlined means "greater than or equal to"
If you mean a zero with a diagonal line through it, it is the symbol for the empty set which is the set that contains nothing.
x >_ b means x is bigger than b or equal to b. x <_ b means x is smaller than b or equal to b. sorry for this stupid characters ;)
if you mean the line then that is normal but if you have jailbroken it then that might be the cause
I suspect you mean the signs < and > meaning "less than" or "greater than". (There is no flip of the inequality sign, which is an equals sign with a line through it). You have to flip when you multiply a "greater or less than" eqequation if you multiply the equatiob through by -1. Example: you have 2>1, and -2<-1.
It means that one factor is greater than (>) or less than (<) some other factor.