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Just google "Collective overall length"...
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All that a search does is confirm that many people have used that term. It doesn't validate the usage.
One of the hits was for containers -
Sea Cell 20
...A container of any preceding claim, longer than a nominal ISO 20' span or actual 19ft10V_in overall outer length limit, with at least part of the extended container length occupying former free space between two 20' ISO series 1 C standard containers when placed end to end in tandem, such that their cumulative or collective overall length is some 40ft, but with reduced wasted intervening space in favour of increased usable load capacity...
So, I would agree that the "C" can stand for almost anything, but in reloading I believe the "best" interpretation is
cartridge. After all, we're not describing the summed length of components lined up. We're describing the length of an assembled cartridge, which involves seating depth.
As an aside, in researching this, I found a thread which described the difference between COL and COAL as -
COL = Cartridge Overall Length
COAL = black mineral commonly mined and used as a fuel
