If you look in the NamesList.txt files of the various versions of the standard, you see that this annotation appeared in Unicode 4.1.0I've just noticed the comment quoted in the subject in the description of 'LATIN SMALL LETTER TURNED DELTA' (U+018D) and I'm intrigued how it got into the standard.
„Obwohl er ursprünglich ein O mit gespiegeltem Ogonek darstellen soll, wird der Buchstabe typografisch meist als ein gedrehter Kleinbuchstabe Delta realisiert”My rough translation :
“Even if it should initally represent a o with mirrored ogonek, the letter is most often typographically realised as a truned small letter delta”Hope this helps.
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