X marks the spot
This mark shows the location, as in On the postcard, X marks the spot where we picked blueberries. Although the use of a cross or X is probably much older, this term was first recorded in 1813.
The Truth Is In The X-FilesRead more in this article about some frequently asked questions and fun facts related to our definitions.
Before X Was X: The Dark Horse Story Of The 24th LetterSince its inception, the letter X has struggled to establish its own identity, so it may be no coincidence that X is commonly used to represent the unknown in both language and mathematics. But, how was it created?
section, spot, scene, station, location, home, ground, slot, office, point, site, seat, place, situation, position, hole, post, plot, hangout, layout
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.