ISO 639-1
si Sinhala; Sinhalese
· filed 2026-07-18 · click a code to copy
Sinhala; Sinhalese carries the ISO 639-1 two-letter code si.
In practice this code appears in HTML (<html lang="si">), HTTP Accept-Language headers, locale identifiers such as si-XX, subtitle tracks and translation files — anywhere software needs to say “this content is in Sinhala”.