The form 黽 in the character zao 𫁘/竈 is taken from the lower part of □(a variant form of □, i.e. the phonetic component of qiu𥤚/秋) and acts as a phonetic in zao 𫁘/竈. The character chao鼂 also uses 黽 as the phonetic component. The form of the character cu鼀 simplifies □ by omitting the form 目 in the middle.