寧
寧 – Ning2 – Tranquil
安寧 – An1 Ning2 – Peace Tranquil — Serenity
What are the chances that some obsessed fan has exhaustively cataloged every Chinese phrase used in every episode of Firefly, and the Serenity movie, and has listed how to write them (simplified AND traditional) with their pronounciations and definitions, as well as cross references to similar phrases and phrases in other episodes? On this internet, 100%.