LT
Short for Less Than, LT is an operator represented as "<" that is used in programming, some commands, and in mathematics.
if ($value1 < $value2) {
do this
}
In the above example, if value1 is less than value2, it would perform the operation do this. Otherwise, it would continue through the program.
The wide edge of the less than symbol always faces to the smaller number. So
with 5 < 1 it's easy to see one is less than five.
Also see: GT, Le, Less than, Programming definitions, Keyboard definitions