Nôm spoon character

Read it as muổng, a small scoop or ladle.

The 1895–1896 Đại Nam quấc âm tự vị (Vietnamese dictionary) describes a ceramic or brass scoop for broth or drinking water. Muổng canh is a larger soup spoon; the entry also groups spoon and fork as muổng nỉa.

How does it fit Vietnamese writing?

It is Chữ Nôm, a script used to write Vietnamese.

Chữ Nôm adapted Chinese characters to write Vietnamese; literary records reach the 14th century. A 2023 Vietnamese-language note records muỗm as a Northern word for spoon. Modern Vietnamese usually uses Quốc ngữ, the Latin-based alphabet.