RPN
n.— «A key direct marketing initiative for the postal service this year is repositionable notes, also known as “yellow stickies.” A test began this month allowing for the use of RPNs on some types of mail for which they are currently prohibited—but a fee also was instituted.» —“Deliver: Carriers, Suppliers Offer New Initiatives” by Melissa Campanelli DM News Apr. 4, 2005. (source: Double-Tongued Dictionary)
Further reading
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...
Cat hair may be something you brush off, but cat hair is also a slang term that means “money.” In the same way, cat beer isn’t alcoholic — some people use cat beer as a joking term for “milk.” And imagine walking on a...