porcelain bowl, tea cup
碗 centers on a small, open container for food or drink: a porcelain bowl or a tea cup. The material and use are the key ideas.
碗 combines 石 (stone, here suggesting porcelain or ceramic material) with 宛, which likely contributes the sound ワン. The character specifically denotes a ceramic bowl or cup.
The left side 石 (stone) hints at the hard, ceramic material. The right side 宛 looks like a container with a lid and a base. Together, 碗 is a porcelain bowl or tea cup.
For ワン, picture a single perfect bowl: one bowl -> ワン. The sound 'one' matches the reading exactly.
rice bowl; tea cup; teacup
chawanmushi; savoury steamed egg custard with chicken, mushrooms, etc. (savory)
bowl (ceramic, porcelain)
bowl (ceramic, porcelain)
coffee cup
tenmoku tea-bowl; dark-glazed conical tea-bowl of Chinese origin
pair of teacups (or rice bowls) for a married couple (one large and one small); his and hers teacups; his and hers rice bowls
hand-moulded earthenware teacup
teacup (small, without a handle)
teacup
rice bowl
Koryo dynasty tea bowl