A measuring spoon is a spoon

Spoon

A spoon is a utensil consisting of a small shallow bowl, oval or round, at the end of a handle. A type of cutlery , especially as part of a place setting, it is used primarily for serving. Spoons are also used in food preparation to measure, mix, stir and toss ingredients...

 kitchen utensil used to measure an amount of an ingredient

Ingredient

An ingredient is a substance that forms part of a mixture . For example, in cooking, recipes specify which ingredients are used to prepare a specific dish. Many commercial products contain a secret ingredient that is purported to make them better than competing products...

, either liquid or dry, when cooking. Measuring spoons may be made of plastic, metal, and other materials. They are available in many sizes, including teaspoon

Teaspoon

A teaspoon, an item of cutlery, is a small spoon, commonly part of a silverware place setting, suitable for stirring and sipping the contents of a cup of tea or coffee...

 and tablespoon

Tablespoon

A tablespoon is a type of large spoon usually used for serving. A tablespoonful, the capacity of one tablespoon, is commonly used as a measure of volume in cooking...

. In the U.S., a measuring spoon is number of pieces, especially four or six. This usually includes ¼, ½, and 1 teaspoons and 1 tablespoon.

Japan

In Japan, usually two spoons are used: a large spoon and a small spoon.
A large spoon is 15 milliliter, and a small spoon is 5 milliliter.
Sometimes much smaller spoon may be used; usually a 2.5 milliliter spoon.