The inequality symbol.
is a friend
comparison operators
comparison operator
If the "comparison symbol" is the equal sign, it is called an "equation". If the symbol is less than, greater than, less-than-or-equal, or greater-than-or-equal, it's called an "inequality".
4 yd < 124 in
> 4 yards is greater than 124 inches.
Logical formulas will have some sort of comparison or condition in them. They will result in a TRUE or FALSE value. They will use some of the comparison operators like the greater than symbol and the less than symbol. They may use some of the logical functions, most commonly the IF function, but also others like AND, NOT and OR.
to
with
The symbol is ≠. If that does not show correctly in the browser, it is the equality sign with with a forward slash through it. In word, you can type 2260 followed by Alt X.
A comparison that is not realistic.