For decades, the team was known as the only NFL team to wear jersey numbers that were not the traditional block-style numbers. Although a handful of other NFL teams such as the early-1960s Pittsburgh Steelers, and the Houston Oilers during their early AFL days experimented with rounder jersey numbers, by the mid-1960s the Bears were the only team left to continue wearing rounded jersey numbers, though on a few occasions in 1971 and 1972 the team appeared in jerseys with plain block numerals. Since the mid-1990s, however, several teams have shifted away from the block numbers in favor of numbers that match a specific team font (e.g. Denver Broncos, Baltimore Ravens, Philadelphia Eagles, etc.) or in the case of the Pittsburgh Steelers, match the jersey number font with the helmet numbers while otherwise leaving the jersey design alone.