Wiktionary
n. (firearms, on a bolt action rifle), corresponding serial numbers on both the removable bolt and the frame of the rifle.
Usage examples of "matching numbers".
Her tone conveyed a natural optimism, as though, having sent in all the forms, having held on to the matching numbers that established her eligibility, she might open the door to someone bearing the keys to her new car or, better yet, that oversized check for several million bucks.
I asked my co-worker, Martha, about it, and since she actually took physics in high school, she knows a bit more about quantum physics (if not quantum qats) than I do/did & after going on about isotopes, elements, electrons and protons in the neutral atom (the latter has matching numbers of electrons and protons), she moved on to half-lives, which amounts to time periods.