A jazz sus chord or dominant 9sus4 chord is a seventh chord on the fifth scale degree of the key with a suspended fourth and an added ninth. Functionally, it can be written as V9sus4 or V7sus9.
ISO (International Organization for Standardization) is an independent, non-governmental membership organization and the world's largest developer of voluntary International Standards.
ISO is the International Standards Organization. The numbers that follow the iso designation are the particular rules and standards agreed to by the international technical and scientific communities to define any number of Technical standards...9000, 9660, 646 and on and on and on...