Published:25th October 20241st January 2025 Last Updated:1st January 2025 Phonetic Alphabet | Signals & Communication Sierra https://nauticalknowhow.mysailingcourse.com/wp-content/uploads/Sierra.mp3Pronounced: see-AIR-rah The term for the letter S in the NATO Phonetic Alphabet. Related Content: Sail LockerSignalling & Communication