Phonetic. From the stone, you can see the sound. Original meaning: inkstone, ink grinder
Smooth stone
Inkstone, stone is slippery. ——"Shuowen". Duan Yucai's note: It means that the stone is slippery in nature.
Make an inkstone. For example: inkstone can be used as a beautiful stone for an inkstone; inkstone material can be used as a stone for an inkstone