Nôm character for giũ

It writes the Vietnamese verb giũ: shake dust or water off.

Is 𪮴 a Chinese or Vietnamese character?

It is a Vietnamese Nôm form built on Chinese-character writing.

Chữ Nôm adapted Chinese characters and their parts to write Vietnamese words. Its early history is difficult to date: a 1978 review says a reported inscription from 1313 could not later be located, and cites early steles including one dated 1173.

Nôm later appeared in longer literary and scholarly writing. The early modern Sino-Vietnamese dictionary Chỉ Nam Ngọc Âm Giải Nghĩa includes a Vietnamese preface written in Nôm.