Formerly, if a season's standard list of names was fully used, subsequent storms would be assigned names based on the letters of the Greek alphabet. According to the WMO's initial policy established in 2006, if, for example, the name Delta were to be retired after the 2020 season, it would be retired as “Delta 2020,” and Delta would continue to be used whenever Greek alphabet letter names were needed again in subsequent years. However, practice was never used, as 2020 Hurricanes Eta and Iota were formally retired without the year by the WMO in 2021. The organization also abandoned the Greek alphabet auxiliary list in favor of a new auxiliary naming list.