XYZ UK /ˌɛks.waɪˈzɛd/US /ˌɛks.waɪˈzi/noun 4phrase 1forms 1phrases 1 noun4 •A generic placeholder representing a specific name or thing. •A generic placeholder representing three items in a list. •The color space of the tristimulus values X, Y, and Z. •Describing a URL scheme for providing map tiles, where X and Y refer to coordinates, while Z refers to zoom level. phrase1 •Initialism of examine your zipper: a discreet warning that one’s trouser fly is undone. formsXYZs Phrases with XYZ for XYZ reasonsFor reasons unknown and not worth speculating on.