Do Split Gallows have rules?

[Grove]

Given common practice in medieval texts, I would think that these special gallows are elaborate versions of the normal thing. If I were researching this topic, my focus would be trying to figure out which more regular occurrence is being made more fancy here.

I have some thoughts about complex gallows characters here:
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Thank you, I just found an earlier thread where you shared this. The thread was entitled “Scribes and elaborate gallows”.