ISDA (International Swaps and Derivatives Association) and BBA (British Bankers’ Association) are organizations that developed standard documentation for OTC derivatives.
ATS is the acronym for Alternative Trading System.
ECN is the acronym for Electronic Communications Network. ECN is the ATS in the US.
ABS is the acronym for Automated Bond System. NYSE’s ABS is the example of the electronic platform which is used to trade bonds.