Less than or greater than equations

We already know

Less than is $<$ greater than is $>$

But a logical step forward is:

A less than or greater than equal to symbol has the symbols we have just learned with an underscore underneath

Example 1

$Dge34$

The line underneath the greater than symbol means "or equal to", so this means D is greater than or equal to 34.

Example 2

$Ble20$

This means B is less than or equal to 20.