Question

What is the inequality sign for "at least"?

Answer 1

Less than is this sign > and then greater than is < and then equal to is this sign = and then not equal is the equal sign with a line through it

Answer 2

The sign used for "at least" is "greater than or equal to". 

It looks like this : $\ge$

Here is an example :

$x\quad \in \quad N\quad (x\quad is\quad a\quad Natural\quad number)\\ \\ x\quad is\quad at\quad least\quad 9$

Can be shown like this :  $x\ge 9$.