Origin

The character 唯 combines the mouth radical on the left, which suggests speech or words, with a sound hint on the right that indicates the pronunciation. The mouth component hints at the idea of speaking or saying something singular and direct, which connects to the meaning of stating something solely or only. The right component provides the phonetic guide for how to pronounce this character rather than adding to its meaning. Together, the parts convey the sense of speaking emphatically about one single thing, which evolved into the meaning "solely" or "only."