Or a hard wooden tip with a pointed metal cap! I think they enforce rules generally to prevent endless arguments at the security check about what is or is not allowed. The scanners are able to detect an “edge” on a metal object as I once had a confusing search of my hand baggage that contained a kitchen blender with four blades each about a centimetre long. The confusion about the search was because the security man could not find any blades yet the scanner was telling him they were there.

All was well and I went on to make nice soups later.