The league returned to Roman numerals for Super Bowl 51 (LI) and has kept that numeration system in place ever since. No plans are in place to return to Arabic numerals for the Super Bowl — yet.

The Roman numerals were adopted to clarify any confusion that may occur because the NFL championship game — the Super Bowl — is played in the year following a chronologically recorded season.

This year's version of the NFL's biggest game is Super Bowl LIX — or Super Bowl 59, if you're not well versed in Roman numerals. Unlike the other major American sports leagues, the NFL uses ...