Definitions of the "Dimensions" in the Trigger Split drop down menu

Hello,

I have an abandoned cart flow. I want to create a trigger split so that if a customer comes back and purchases (from the flow or some other way) they exit  the flow.

I see I can set the criteria for when the user exits by setting a dimension, condition and dimension value. The issue is that I do not know the definition of each of the dimensions in the Dimension drop down.

Are the definition of each item in the drop documented anywhere. I could not find it in the flow or conditional split docs online.

The drop down has these choices. I’d like to know how each is defined. For my immediate needs, how would I set this to mean “user purchased something” but knowing all the dimension definitions would be quite helpful

Dropdown

Attributed Flow

Attributed Message

Attributed Message Variation

Collections

Discount Codes

Email Domain

Item Count

Items

ShippingRate

Source Name

tags

Total Discounts

$value