sierra

n. a long line of mountains with sharp, uneven tops that look like the teeth of a saw.

n. a range of mountains with a jagged or serrated ridge, especially in Spain or Spanish-speaking America.

“The sun set behind the high sierra, casting long shadows over the valley.”

“The expedition struggled to navigate the rugged terrain of the high sierra, where the jagged peaks made traditional mapping nearly impossible.”

Literary

n. the word used for the letter 'S' when speaking over the radio to avoid mistakes.

n. the standard code word for the letter 'S' in the NATO/ICAO phonetic alphabet.

“The pilot confirmed the tail number as Alpha-Bravo-Sierra.”

“To ensure clarity over the static-filled radio channel, the operator spelled out the coordinates using Sierra and Tango.”

Technical