Service Connection Points (SCP) are objects in Active Directory that hold information about services. Services can publish information about their existence by creating serviceConnectionPoint objects in Active Directory.
In turn client applications then use this information to find and connect to instances of the service. Some common systems that use SCPs are Exchange, SCCM and Terminal Server.
This guide shows you how to find out what servers are advertising terminal server SCPs and how to delete them if the SCP in question if it no longer exists in your organisation.