Hello Mary,
Thank you for your question. I understand how frustrating it can be to find two different examples for the same guideline. In this case, neither example is incorrect. The general rule for special symbols is to use the wording from the corresponding code, which in this instance is Unified English Braille (UEB). Technically, the word “mention” should be used, as it comes directly from the symbol description in the UEB code book. However, upon further investigation, I discovered that the authors of the Braille Format Guidelines intentionally omitted the word “mention” from the description to ensure that it would fit on a single braille line.
Michael