liner
n.— «The dealers search for coins that are the “sliders,” or the “liners,” as they are called, the ones that might glint in such a way on a certain day to become a 65, instead of a 64, in the eye of the right coin grader. It’s not illegal, but sins have been committed in the name of grading arbitrage in the high-dollar, fast-paced rare coin world.» —“Coin fund profits for state hinged on graders’ opinions” by Christopher D. Kirkpatrick Toledo Blad (Ohio) May 30, 2005. (source: Double-Tongued Dictionary)
Further reading
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There are eight major planets, but more than a million minor ones, including asteroids. If you discover one, you get the honor of naming it. The Dictionary of Minor Planet Names includes minor planets named for rock bands, jazz musicians, poets, and...