In additiona to the Cryptomatte AOV, these various utility AOVs are useful for a variety of different passes, intended to be used with a compositing application.

Irradiance AOV - Any surface which contributes to the lighting or reflected lighting of the scene will be included in this AOV.

Light Direction AOV - Outputs lighting direction information for the scene.

Noise AOV - Outputs a noise map of the scene.

PostFX Media AOV - Outputs the post process volume effects from the Imager object. 

Post Processing AOV - Outputs the post processing pass from the Imager object.

Shadow AOV - The shadow AOV contains all direct light shadows that are calculated on the first path bounce. The AOV includes sun light provided by the Octane Daylight Environment. The Shadow pass excludes the Texture Environment if the texture environment does not consist of an image.