According to an articlearticle, the small trophy commemorated his 23 Grand Slam titles3 French Open victories:
Sporting a jacket with the number 23 on it,Novak Djokovic received the Coupe des Mousquetaires from former French great and 1983 winner Yannick Noah, plusgrabs a smallspecial trophy with allgiven for his 23 titles engraved3 victories at Roland Garros.
It included a photo of the trophy, which you can see has "2016", "2021", and "2023" engraved on it, which are the 3 years in which he has won the French Open so far.