'uncle8' It's mostly known or called a Turn & Bank indicator by the Yanks but I believe it's a Turn & Balance indicator meaning if the ball is centered & the bat (if it's a ball & bat unit) is lined up with the offset ref mark then yr turning correctly/balanced at a rate one turn.
At the end of the day they mean one of the same thing when the term 'T&B' has been written.
Used to reg use the T&B on many an IFR renewal.
Wmk2