Prior to the K-Liste (What is the Kurzgefasste Liste der griechischen Handschriften des Neuen Testaments?), there were several different systems for cataloging New Testament manuscripts, which created confusion and inconsistencies for scholars. For a while, Latin letters were used (i.e. Codex Vaticanus is 'B'), but when there were more manuscripts than letters in the Latin alphabet, some people started using Greek letters (i.e. Codex Sangallensis is 'Δ') and one person used a...