Yes, that is a simple rule. Much more simple than, say, a rule where you name the building and then the room number in it...pic.twitter.com/EeqcKbvhke
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Thanks! Mark, clearly you and I are in the same list. 
Sorry if you knew about them already! 
I only recently found out the story behind stigma. I never questioned it at school in 6th, i.e., stigma, year. Amusing it's called stigma.
I wonder if the etymology/semantics have any overlap.
With your (Greek) "tragic" history i wouldn't be surprised.
The story behind stigma the letter: it's a letter that's been lost but recreated using sigma + tau for numerals. https://en.m.wikipedia.org/wiki/Stigma_(letter) …
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