greatest common divisor

《初等数论》 · 第 5 页

整数 $a_1,a_2,\dots,a_n$ 的公因数中最大的一个叫作最大公因数，记作 $(a_1,a_2,\dots,a_n)$。

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《LECTURE NOTES IN ANALYSIS (2011)》 · 第 7 页 · Section 1.2「Divisibility」，Definition 1.2

The integer $a$ is a common divisor of $b$ and $c$ in case $a\mid b$ and $a\mid c$. If at least one of $b$ and $c$ is not $0$, the greatest among their common divisors is called the greatest common divisor of $b$ and $c$ and is denoted by $(b,c)$.