Carabineer mail ntust

I think you meant to type "carabiner" and "must not".

A carabiner is a type of metal clip used in climbing, mountaineering, and other outdoor activities to connect ropes, harnesses, and other equipment.

As for "must not", it's a phrase used to indicate prohibition or prohibition. For example:

• "You must not climb without a carabiner."
• "The carabiner must not be used as a makeshift tool."

Let me know if you have any other questions or if there's anything else I can help you with!