Everyone’s blood falls into one of four groups, or types: A, B, AB, or O.

The type of blood depends on the presence, or absence, of certain substances on red the blood cells. Blood types are inherited.

In blood transfusions, the people giving and those receiving the blood must belong to the same blood type (blood group), or a dangerous reaction will take place from the agglutination that occurs when blood of a different group is present.

One exception is that group 0 Rhesus-negative blood can be used in an emergency for anyone.

A somewhat old-fashioned term used to classify the human shape into three primary types: ectomorphic (a lean, only slightly muscular body with long limbs), mesomorphic (a robust muscular body-build characterized by predominance of structures; including bone and muscle and connective tissue; with pronounced muscular development and low body fat), or endomorphic (characterized by big bones, round face, large trunk and thighs and a naturally high degree of body fat; especially, around the midsection).

One of the four basic bone shapes in the human skeleton; including: long bones, short bones, flat bones, and irregular bones.

Long bones have a tubular shaft and articular surface at each end and refer to the arms (humerus, radius, and ulna) and the legs (the femur, tibia, and fibula) are all long bones.
1. Short bones also have a tubular shaft and articular surfaces at each end; however, they are much smaller and include all of the metacarpals and phalanges in the hands, the metatarsals and phalanges in the feet, and the clavicle (collarbone).
2. Flat bones are thin and have broad surfaces includeing the scapula (wingbone), the ribs, and the sternum (breastbone).
3. Irregular bones are irregular in size and shape and are usually quite compact; for example, the bones in the vertebral column, the carpal bones in the hands, tarsal bones in the feet, and the patella (kneecap).

In computer science is sometimes called the logical data-type, and is a primitive data-type having one of two values: "true" and "false".

Microphones in which the voltages are varied by an electromagnet; such as, ribbon or velocity microphones, dynamic or moving-coil microphones, and reluctance or moving-vane microphones.

• Ribbon or velocity microphones are those in which electric output depends on the velocity of the air particles that form a sound wave; examples are a hot-wire microphone and a ribbon microphone in which the conductor is a thin ribbon of aluminum alloy moving perpendicularly in a magnetic field. It is strongly directional and can be used to reduce unwanted side noise.
• Dynamic or moving-coil microphones consist of moving-conductor microphones in which the flexible diaphragms are attached to a coil positioned in the fixed magnetic fields of a permanent magnet.
• Reluctance or moving-vane microphones consist of diaphragms acted upon by sound waves that are connected to armatures which vary the reluctance in magnetic fields each of which is surrounded by a coil.

The unfounded conviction that the patient's spouse or lover is unfaithful: "Such jealous-type paranoias can sometimes be so overwhelming that they make the relationships of such patients impossible."

An individual who has fixed systematized delusions, is suspicious, has a persecution complex, is resentful and bitter, and is a megalomaniac (mental condition where the patient exhibits delusions of grandeur or a greatly enhanced opinion of himself/herself).

A taxonomic unit in soil science: Soil types are those that share a specific set of accurately defined properties for a certain soil type.

A telemeter that employs the magnitude of a single voltage as the translating procedure.