What is the white number inbetween the set scores on the new wimbledon score boards?

Question

What is the white number inbetween the set scores on the new wimbledon score boards?

Answer 1

It's the point score of the player who lost the tiebreaker.

Answer 2

That's the number for a tie breaker score if they are playing a tie breaker :)

Answer 3

Incase there was a tie-brake in the set, the little number indicates the number of points that the loser of the tie-brake had.