There is no consensus on the scope forex margin call explained sum naming convention for different types of IRS. Even a wide description of IRS contracts only includes those whose legs are denominated in the same currency.
It is generally accepted that swaps of similar nature whose legs are denominated in different currencies are called cross currency basis swaps. In traditional interest rate derivative terminology an IRS is a fixed leg versus floating leg derivative contract referencing an IBOR as the floating leg. If the floating leg is redefined to be an overnight index, such as EONIA, SONIA, FFOIS, etc. Some financial literature may classify OISs as a subset of IRSs and other literature may recognise a distinct separation.
Fixed leg versus fixed leg swaps are rare, and generally constitute a form of specialised loan agreement. Float leg versus float leg swaps are much more common. The legs on SBSs will necessarily be different interest indexes, such as 1M, LIBOR, 3M LIBOR, 6M LIBOR, SONIA, etc. The pricing of these swaps requires a spread often quoted in basis points to be added to one of the floating legs in order to satisfy value equivalence. Interest rate swaps are used to hedge against or speculate on changes in interest rates. Interest rate swaps are also used speculatively by hedge funds or other investors who expect a change in interest rates or the relationships between them.