When may the same player number be repeated in a lineup?

A player number may never be repeated in a lineup during a volleyball match. Each player on the team must have a unique number assigned to them that remains consistent throughout the match. This rule is established to avoid confusion and ensure clarity in officiating, as officials rely on player numbers to track individual players for calls, substitutions, and scoring.

In situations where a team has fewer than six players, the rules still maintain that each player's number must be unique. The idea is to uphold the structural integrity of the game, allowing for accurate timing and record-keeping, regardless of the number of players available. Legal substitutions, while they can change which players are on the court, do not affect the requirement for unique player numbers in the lineup.

Thus, having repeated player numbers is fundamentally at odds with the rules governing team identification and player accountability within the sport.