Why does $\mathbb{Z}$ denote the set of integers?

The set of Natural Numbers is denoted by $\mathbb N$ (For Natural)

The set of Rationals are denoted by $\mathbb Q$ (for quotient)

The set of Complex numbers are denoted by $\mathbb C$ (for complex)

The set of Real numbers are denoted by $\mathbb R$ (for Real)

Why is the set of integers denoted by $\mathbb Z$?

• Zahl(en) = number(s) , in german. – DonAntonio Sep 26 '13 at 16:31
• Was the title inspired by this question? math.stackexchange.com/questions/493739/… EDIT: The title was changed to something more reasonable. – Oscar Cunningham Sep 26 '13 at 16:33
• I guess it is because the Germans happen to inhabit Earth (and Germany in particular for the most of them, but notational conventions often, and fortunately, do transgress national boundaries). – Marc van Leeuwen Sep 26 '13 at 16:51
• A stupid memory aid is IntegerZ. – JP McCarthy Sep 26 '13 at 17:18
• Huh, I thought $\Bbb N$ was for "numbers". – MJD Sep 26 '13 at 18:30