Running text requirement?

[Ken Shirriff]

Someone asked me about the requirement for evidence that proposed new
characters are used in running text. I thought it was in the Symbol
Guidelines (http://www.unicode.org/pending/symbol-guidelines.html) or the
Character Proposals document (http://unicode.org/pending/proposals.html)
but it's not there. Is there a written requirement for running text
somewhere or is it "tradition"?

Ken
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