(Note: all my math transcriptions are UEB Math/Science)
Oftentimes in math textbooks, we will see print symbols that are shown for illustration rather than actually being used. Does this usage require a ‘Dot locator for “mention”‘ before the symbol?
My other contact got back to me (I actually checked with three other people) and here is the consensus:
The dot locator for mention is designed for use in situations where the braille cell itself is under discussion. We do not employ the dot locator for mention for symbols (like letters, punctuation, math operators, shapes, etc.) that happen to be on their own within the flow of text.