Forth

Proper noun

 * 1)  that flows for about 47 km (29 miles) from The Trossachs through Stirling to the Firth of Forth on the North Sea.
 * 2) A sea area that covers the Firth of Forth

Etymology 2
From, for "fourth-generation programming language"; the u was dropped because the IBM 1130 operating system limited filenames to five characters.

Proper noun

 * 1) An imperative, stack-based high-level concatenative programming language, used mostly in control applications.
 * PostScript is another concatenative language similar to the Forth family of languages.