The ampersand symbol at the bottom of page 50 (under Misc Symbols) of Guidelines for Technical Material was corrected in an update on in August 2014. The 5-page Errata can be found on the BANA website. I'll attach an image of what it says. I'll also attach an image of what you should look for on the BANA website under Code Books and Guidelines. Hope this helps.
Betty Marshall
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