Benelux

[ ben-l-uhks ]
/ ˈbɛn lˌʌks /

noun

a customs union comprising Belgium, the Netherlands, and Luxembourg, begun January 1, 1948.
Belgium, the Netherlands, and Luxembourg considered together.

British Dictionary definitions for benelux

Benelux
/ (ˈbɛnɪˌlʌks) /

noun

the customs union formed by Belgium, the Netherlands, and Luxembourg in 1948; became an economic union in 1960
these countries collectively