By 1963, Kurt Aland, in his Kurzgefasste Liste, had enumerated 250, then in 1989, finally, 299 uncials.
Succeeding generations used this pattern, but newly discovered manuscripts soon exhausted the Latin alphabet.
[3][4] When Greek and Hebrew letters ran out, Gregory assigned uncials numerals with an initial 0 (to distinguish them from the symbols of minuscule manuscripts).
[2] As of 2012[update] over 320 sigla for uncial codices have been catalogued by the Institute for New Testament Textual Research (INTF) in Münster, Germany.
[further explanation needed][2] Uncial 0212 from the 3rd or 4th century is more properly a witness to the Diatessaron than to the New Testament itself.
The first 45 uncials have been assigned descriptive names as well as a single letter code called a siglum, for usage in academic writing.
Beginning with uncial 046 the assignment of sigla was dropped and only a few manuscripts thereafter received a descriptive name.