Gregory assigned the papyri a prefix of P, often written in blackletter script (), with a superscript numeral. The uncials were given a prefix of the number 0, and the established letters for the major manuscripts were retained for redundancy ("e.g." Codex Claromontanus is assigned both 06 and D). The minuscules were given plain numbers, and the lectionaries were prefixed with l often written in script (ℓ). Kurt Aland continued Gregory's cataloging work through the 1950s and beyond. Because of this, the numbering system is often referred to as "Gregory-Aland numbers". The most recent manuscripts added to each grouping are , 0323, 2928, and "ℓ" 2463. Due to the cataloging heritage and because some manuscripts which were initially numbered separately were discovered to be from the same codex, there is some redundancy in the list (i.e. the Magdalen papyrus has both the numbers of and ).