List of Mathematical Symbols. • R = real numbers, Z = **integers**, N=natural numbers, Q = rational numbers, P = irrational numbers.

Integers (Z). This is **the set of all whole numbers plus all the negatives (or opposites) of the natural numbers**, i.e., {… , ⁻2, ⁻1, 0, 1, 2, …} Rational numbers (Q).

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The notation Z for the set of integers **comes from the German word Zahlen, which means “numbers”**. Integers strictly larger than zero are positive integers and integers strictly less than zero are negative integers.

Contribute To this Entry » The doublestruck capital letter Z, , **denotes the ring of integers** …, , , 0, 1, 2, …. The symbol derives from the German word Zahl, meaning “number” (Dummit and Foote 1998, p. 1), and first appeared in Bourbaki’s Algèbre (reprinted as Bourbaki 1998, p.

Outside Russia, the symbol has been banned from public display in various countries. The “Z” symbol has been pejoratively called a zwastika or zwaztika, in reference to the Nazi swastika, or pejoratively in Russian and Ukrainian as “ziga” (Russian: зига) in reference to Sieg Heil.

The Z notation /ˈzɛd/ is **a formal specification language used for describing and modelling computing systems**. It is targeted at the clear specification of computer programs and computer-based systems in general.

Z^{+} is **the set of all positive integers** (1, 2, 3, …), while Z^{–} is the set of all negative integers (…, -3, -2, -1). Zero is not included in either of these sets . Z^{nonneg} is the set of all positive integers including 0, while Z^{nonpos} is the set of all negative integers including 0.

To get the letter, character, sign or symbol “Z” : ( Capital letter Z ) on computers with Windows operating system: 1) **Press the “Alt” key on your keyboard, and do not let go.** **2) While keep press “Alt”, on your keyboard type the number “90”**, which is the number of the letter or symbol “Z” in ASCII table.

**Z, or z**, is the 26th and final letter of in the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its usual names in English are zed (/ˈzɛd/) and zee (/ˈziː/), with an occasional archaic variant izzard (/ˈɪzərd/).