It is a saucer.
A saucer
Java is slang for coffee. The cup and saucer represent a cup of coffee, or java.
I have both the cup and saucer yes.
It's for stability. The groove usually matches exactly with a cup from the same tea set. it's designed to keep the cup on the saucer.
Coffee cools down faster in a saucer than a cup because the saucer has a larger surface area in contact with the air, allowing for faster heat transfer. The wider area of the saucer helps to dissipate the heat more quickly compared to the smaller surface area of the cup.
In India people pour tea out of their tea cup into the saucer as a way to cool down the tea and also as a way to split a cup between two people . The design of a cup and saucer is derived from a Chinese brewing cup that featured a bottom plate.
The value of a Rosina bone chine cup and saucer is between $15 and $50 USD. A set of a cup and saucer have more value than a single piece, but a collection of cups and saucers has the most value.
saucer
· saucer
Made in Occupied Japan Wako teacup and saucer
A saucer is a small plate designed to hold a mug or cup. It can also refer to anything that is roughly saucer-shaped, like an alien spaceship.