A Box Month is a month in which the first day of the month begins on a Sunday and the calendar of the month forms a perfect rectangle. The only month in which this can occur is February, since it has 28 days. The occurrence of this event is quite rare. Since a Box month cannot occur on a leap (due to the 29 days), the pattern of re-occurrence follows a 6-11-11...6-11-11 year interval. For example the years in which a Box Month occur are 1981-1987-1998-2009-2015-2026, following the 6 yr, 11 yr, 11 yr pattern.

This rare event is celebrated throughout the month in commemoration of this rarity within the Calendar.

Short for ultimate bias. Typically used by fangirls and fanboys to describe their favourite celebrity amongst the many that they are fans of.