tip-on n. a promotional item, such as a magnet or game piece, affixed to the cover of a publication. (source: Double-Tongued Dictionary)
Further reading
Quiz Guy John Chaneski came across the term hugger-mugger, which inspired a puzzle with answers that involve two words, each ending in -er. For example, in the past these were attached using a sticky surface, but these days they’re made from...
Asthenosphere, a geologist’s term for the molten layer beneath the earth’s crust, sparks a journey that stretches all the way from ancient Greece to the author of Uncle Tom’s Cabin. Plus: What the heck is a dogberg? It’s when...