Here are some examples:
* "That team is in a league of their own, they're simply unbeatable." - This means the team is so good that they are better than any other team.
* "Her talent is in a league of its own, she's a true original." - This means her talent is so unique and exceptional that it can't be compared to anyone else.
* "This museum's collection is in a league of its own, it's truly breathtaking." - This means the museum's collection is so impressive and extraordinary that it's unmatched by any other collection.
The phrase originates from the 1992 movie "A League of Their Own," which tells the story of a women's baseball league during World War II. The film's title reflects the idea that these women were pioneers, breaking new ground and playing a game that was traditionally seen as a man's sport.