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Also, the 2032 numbering indicates its physical size: it's 20mm x 3.2mm. There are for example 2025's (like in my car remote) that are 20mm x 2.5mm.
And CMOS refers to what the battery was powering on the motherboard (a small amount of CMOS static RAM) rather than anything about the battery itself. I don't know if motherboards still use any static RAM, the batteries might only be there to power the clock these days, making the name just a historical convention.
It goes beyond button batteries too. Lots of batteries use the same system. For instance, many flashlights run off of 18650 cells.