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The distance from one side of a circle to the other, passing through the center point. It is a fundamental measurement used in geometry and daily life to describe the size of round objects like plates or pipes.

面積 refers to the measurement of the size of a surface or the amount of space inside a two-dimensional shape. It is commonly used in mathematics, real estate, and geography to describe how much space a flat object or land occupies.

The degree to which a substance is contained within a solution or mixture, or the depth of color and thickness of a liquid. It is commonly used in scientific, culinary, and environmental contexts to describe how strong or weak a solution is.

A four-legged herbivorous mammal known for its antlers and graceful movement. In Japan, they are particularly famous for roaming freely in areas like Nara Park where they are considered sacred.

A large, powerful bird of prey with a massive hooked bill and broad wings, known for its keen eyesight and soaring flight. In Japanese, it specifically refers to larger raptors, often serving as a symbol of strength and majesty.

A hawk is a bird of prey known for its sharp eyesight, curved beak, and powerful talons. In Japanese culture, it is often used as a symbol of nobility, strength, and keen perception.

A large marine mammal that breathes air through a blowhole and lives in the ocean. In Japanese, it refers to all types of whales, often seen as symbols of nature's vastness.

A very small piece or bit of matter, such as a grain of sand, a speck of dust, or a microscopic unit like an atom or molecule. It is commonly used in scientific contexts to describe the fundamental components of a substance or in photography to describe the grain of an image.

Refers to an electron in a scientific context or, more commonly, signifies that something is digital or electronic. It is frequently used as a prefix to describe modern technology replacements for traditional items like books or money.

A neutron is a subatomic particle found in the nucleus of an atom that carries no electric charge. It has a mass slightly larger than that of a proton and is essential for the stability of atomic nuclei.