In programming, the not equal sign is used to check whether two values are different.

You need not apologize for being late; everyone understands.

When teaching basic logic gates, the instructor demonstrated how the NOT operator inverts a signal from true to false.

The antique chair was not long for the living room and would soon be moved to storage.

Visitors must not feed the animals in the sanctuary.

I don't mean to be rude, not to put too fine a point on it, but your report omits several crucial facts.

The aftermath of the storm, with fallen trees and flooded streets, was not a pretty sight.

She found an old map tucked behind a stack of tins at the what-not shop on Elm Street.

She was not quite ready to leave when the phone rang.

The old pocket watch was not worth a dime, but he couldn't bring himself to throw it away.