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.
Here's a brief summary of what the ISO means, where the term comes from, and what's the correct way to pronounce ISO (many photographers say it wrong). A lot of photographers assume ISO is an acronym, and various online resources may even tell you that it stands for International Standards Organization..