Mike Rowe did name a lot of threads you may find. I would like to put a few more of the obscure ones you may find.
BSB (British Standard Brass) this one can cause a lot of angst because it has the same inch thread count no matter what the diameter is always 26. This threading can be found on cleaning rods and accessories especially "Parker Hale."
BSP (British Standard Pipe)
BSPT (British Standard Pipe Tapered)
ME (Model Engineer)
Not all guns started out with these odd ball threads. but used on repairs especially holes with striped threads with British Cycle and Model Engineer very often found.
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