Year 55 (LV) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Caesar and Vetus (or, less frequently, year 808 Ab urbe condita). The denomination 55 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

The Brazilian telephone numbering plan uses a two-digit area code plus eight-digit local phone numbers (nine digits for mobile lines in some area codes from a few states). Public utility services use three-digit phone numbers, always starting with 1.