A ring girl is a woman that enters a combat ring between rounds. She carries a sign that shows the number of the upcoming round. You’ll often see ring girls at boxing, kickboxing, and mixed martial arts events.
Wikipedia says, “Ring girls first appeared in a 1965 edition of Ring Magazine. The magazine published a photo of a Las Vegas model holding a sign at a boxing match. Boxing promotions adopted the concept of ring girls.”
If it’s on the Internet it must be true, right?