olemus
UML-liidese tüüp, millega esitatakse rakendamise sõltuvus klassifikaatorist ringina (kuulina) ja kasutuse sõltuvus poolringina (pesana)
= the type of UML interface in which the implementation dependency from a classifier to the provided interface is displayed as a circle (ball) and the usage dependency from a classifier to the required interface is displayed as a half-circle (socket)

näiteid
https://duckduckgo.com/?t=h_&q=ball-and-socket+notation&iax=images&ia=images

ülevaateid
https://martinfowler.com/bliki/BallAndSocket.html