What do the numbers for defining mesh faces mean? E.g. Q{30;27;23;26}

One of the results of the Deconstruct Mesh component is Mesh Faces.
Grasshopper defines mesh faces using integers after Q.
I am trying to understand what the Q and numbers mean here.


The V output provides an indexed list of vertices. Each mesh face - in your case - is defined by four vertices and refers to them by index. That’s cheaper than storing a separate copy of a three-dimensional point.

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I understand now, Thanks!

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