The maker's mark.
a product called Bar Keepers Friend. It's a miracle cleaner for the bottom of pans, bottom of copper pans, stainless steel sinks.
the marks have to be pointing each other in the center of the gears
impasto
The North and South Poles.
uses in layers of short straight marks
the art is called myans art
skid marks
On your top and bottom pulleys ,you have timing marks,they should line up when time is correct.
They're simply called Proofreaders' Marks.
Graduations, or graduation marks.
By the Big-Little rule, the name of an art show should be in italics. An art show is a big achievement!
Date of manufacture and location