Batch designation
From Tardis Wiki, the free Doctor Who reference
The Forces of the Red Jade General were individually distinguished by what the Tenth Doctor termed batch designations. These included 10-0-B15, 2-B-04, 2-B-01 and 17-B-21. (COMIC: Sharper Than a Serpent's Tooth [+]Loading...["Sharper Than a Serpent's Tooth (comic story)"])
