telltale
n.— «There’s less clutter on the faces of the tach and speedo since the idiot lights (Chevrolet refers to them as “telltales”) have been moved to a space between the two major gauges.» —“Driving the C6 Shows it Exceeds Expectations” by Bob Wallace Vette Aug. 2, 2004. (source: Double-Tongued Dictionary)
Further reading
A ballicater is a jagged wall of ice that forms on a frigid shore when pans of ice catch on rocks and slush freezes over them. A Canadian woman who grew up in Newfoundland says she’s warned never to go near one. Ballicater, spelled several ways...
The Merriam-Webster.com dictionary now includes an entry for TL;DR, also rendered as TLDR. It’s a speedy way of dismissing overlong text or introducing a shortened version of something. This useful locution also inspired AI;DR, short for AI;didn’t...