Not equal to sign is the symbol that you see here in red ≠ that we use to indicate that two numbers do not have the same value.
We read ≠ as is not equal to.
1 ≠ 2 Read as one is not equal to two
-2 ≠ 5 Read as one negative two is not equal to five
7 ≠ 4 Read as negative nine is less than negative two