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Xerography - An electrostatic, non impact printing process in which intense heat fuses dry toner particles to electrically charged areas on the paper to create an image. The charged areas of the paper appear black on the copy, while the uncharged areas remain white. a photocopying/printing process in which the image is formed using the electrostatic charge principle. The toner replaces ink and can be dry or liquid. Once formed, the image is sealed by heat. Most page printers currently use this method of printing.

X-height - the height of a letter excluding the ascenders and descenders; eg 'x', which is also height of the main body.

Yankee dryer - A device that dries as it comes off the wet end of the paper making machine by pressing one side of the paper against a cylinder that seam-heats it and imparts a glazed finish at the same time.

Zip Code Sorting - Presorting mail, other than first class, into zip code sequence prior to delivery to the post office. The extent of the sorting is dependent upon the class of the mail and other postal regulations.