What does ModifiableContactPoint.Index represent?

Unity Engine
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I am working with extracting contact data Unity Physics’ collision system so every piece of information I can get out of ModifiableContactPoint/ ModifiableContactHeader is essential for my usecase. I am curious what exactly ModifiableContactPoint.Index represents (what specifically is it an index for)?

Find specific *index* of point from convex hull (not just Position) invlolved in a collision
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See com.unity.physics\Unity.Physics\Dynamics\Simulation\IContactsJob.cs

        /// Index of this point, within the ModifiableContactHeader
        public int Index { get; internal set; }

A contact can be made up of multiple points. E.g. a cube lying on one face on a flat plane would have 4 points making up the contact between plane and cube.

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