Z

n. 26th letter of the alphabet; unknown, variable (Mathematics)

Z is the twenty-sixth and final letter of the modern Latin alphabet.In many dialects of English, the letter's name is zed , reflecting its derivation from the Greek zeta (see below). In American English dialects, its name is zee , deriving from a late 17th-century English dialectal form. Another English dialectal form is izzard, which dates from the mid-18th century, probably deriving from the French et zède, meaning "and z," or else from "s hard." A variant izzed is the predominant form in anglophone South Asia.
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Ź (minuscule: ) is a letter of the Latin alphabet, formed from Z with the addition of an acute. It is used in Polish, as well as in phonetic transcription, to represent a voiced alveolopalatal fricative (IPA: ).
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Ž (minuscule: ž) is: the 25th letter of the Slovenian alphabet, the 30th letter of the Bosnian, Croatian and Serbian scripts; the 42nd letter of the Czech; the 19th letter of the Estonian; the 33rd letter of the Latvian; the 32nd letter of the Lithuanian; the 46th letter of Slovak; the 13th letter of the Turkmen alphabet and the 29th letter of the Sami alphabet. It also features occasionally in Finnish. In addition, the character is also used as a transliteration of Cyrillic /Ж/ in Macedonian (in 31st position) and occasionally in Bulgarian (with no special running order of Roman characters) in. It denotes a similar phoneme to the Portuguese and French J. Apart from Estonian and Turkmen, this is the final letter of the other alphabets. In English, it is pronounced like the /g/ in genre.
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In computing, control-Z is a control character in ASCII code, also known as the substitute (SUB) character. It is generated by pressing the Z key while holding down the Ctrl key on a computer keyboard.Control-Z was one of a handful of keyboard sequences chosen by the program designers at Xerox PARC to control text editing. It is used to undo the last cut-and-paste operation performed by the user. Presumably these particular keystrokes were chosen because of their location on a standard QWERTY keyboard, since the Z (undo),at the left end of the bottom row of the standard QWERTY keyboard. Such usage continues today in many GUI-based operating systems (including Microsoft Windows and Mac OS (although here the Command key is used instead of the control key)) and word processing software. Some software programs also provide a keystroke that functions as the opposite redo operation, which re-applies the last editing operation, generally activated by a control-Y or control-shift-Z.
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When used as a diacritic mark, the term dot is usually reserved for the Interpunct ( · ), or to the glyphs 'combining dot above' ( ) and 'combining dot below' ( ) which may be combined with some letters of the extended Latin alphabets in use in Central European languages and Vietnamese.
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Z++ is also a version of the C++ programming language. Z++ (pronounced zed plus plus) was an object-oriented extension to the Z specification language.
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n. z, 26th letter of the alphabet

number, mathematical value or its symbol

to, toward the previous condition; in accordance with, at, toward

n. z, 26th letter of the alphabet; variable (Mathematics)

n. z, 26th letter of the alphabet; (Mathematics) unknown, variable