在
zài · HSK 1
to exist; to be alive; (of sb or sth) to be (located) at
📍 在 = earth 土 + talent 才; locating where something stands on the ground
The character pairs 才 (sprout/talent, also lending the zài sound) with 土 (earth) — a thing planted at a spot. Use it for 'at/in/on' a location, and as the progressive marker before verbs (在吃 = is eating).
在 — earth 土 + phonetic 才
Originally a phono-semantic compound: 土 (earth) gives the meaning of a place or location, while 才 supplies the sound. It came to mean 'to be present/located at,' and now also serves as a grammatical marker for ongoing actions, like 'in the middle of doing.'