Decorative Arts

What is the difference between a coffee cup, Tea cup, Espresso cup?

I am listing something on ebay.
But it i am not sure what it classifys as.
It is a little cup w/handle. like a tea cup.
And it has a saucer.

Coffee cup is a regular-large sized cup/mug (largest of the 3)

Tea cup is a small-sized cup/mug and is usually accompanied with a saucer

Espresso cup is generally not much bigger than a shot glass (smallest of the 3)

Bone Marrow 035

Enesco Children of the Inner Light Heart Shaped Tea Cup & Saucer , 3-1/2-Inch $19.22 Clever heart shaped cup and saucer magically reveals a heart shaped image when dark liquids are added to the cup. Coordinates with the home and family tea pot from Children of the Inner Light….

Caleca Pink Garland 9-Piece Tea Set, Service for 4 $55.99 Manufactured and decorated by hand in Sicily for over 200 years, this Italian pottery from Caleca maintains a high level of durability, beauty, and tradition. Individually constructed and painted by hand, each piece receives a stamp ensuring its authenticity. With or without the official seal, the brightly saturated colors and whimsically fresh patterns are instantly recognizable as Caleca designs…

Lomonosov Russian fine porcelain tea-maker covered tea cup/saucer $59.00 Produced by highly skilled artisans at the Lomonosov Imperial Porcelain Factory in St. Petersburg, Russia. The factory was established in 1744 to serve the need of the Court of the Russian Czar and has won many awards world-wide for wonderful quality porcelain dinnerware….