3/4 In. Ball Joint Separator – PITTSBURGH AUTOMOTIVE

3 (three) is a number, numeral and digit. It is the natural number following 2 and preceding 4, and is the smallest odd prime number and the only prime preceding a square number. It has religious and cultural significance in many societies.

4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is a square number, the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures.

A ball is a round object (usually spherical, but can sometimes be ovoid) with several uses. It is used in ball games, where the play of the game follows the state of the ball as it is hit, kicked or thrown by players. Balls can also be used for simpler activities, such as catch or juggling. Balls made from hard-wearing materials are used in engineering applications to provide very low friction bearings, known as ball bearings. Black-powder weapons use stone and metal balls as projectiles.

Although many types of balls are today made from rubber, this form was unknown outside the Americas until after the voyages of Columbus. The Spanish were the first Europeans to see the bouncing rubber balls (although solid and not inflated) which were employed most notably in the Mesoamerican ballgame. Balls used in various sports in other parts of the world prior to Columbus were made from other materials such as animal bladders or skins, stuffed with various materials.

As balls are one of the most familiar spherical objects to humans, the word "ball" may refer to or describe spherical or near-spherical objects.

"Ball" is used metaphorically sometimes to denote something spherical or spheroid, e.g., armadillos and human beings curl up into a ball, making a fist into a ball.

A joint or articulation (or articular surface) is the connection made between bones, ossicles, or other hard structures in the body which link an animal's skeletal system into a functional whole. They are constructed to allow for different degrees and types of movement. Some joints, such as the knee, elbow, and shoulder, are self-lubricating, almost frictionless, and are able to withstand compression and maintain heavy loads while still executing smooth and precise movements. Other joints such as sutures between the bones of the skull permit very little movement (only during birth) in order to protect the brain and the sense organs. The connection between a tooth and the jawbone is also called a joint, and is described as a fibrous joint known as a gomphosis. Joints are classified both structurally and functionally.

Separator can refer to:

• A mechanical device to separate fluids and solids, like
  • Cream separator, separates cream from milk
  • Demister (vapor), removal of liquid droplets entrained in a vapor stream
  • Separator (oil production), of an oil production plant
  • Vapor–liquid separator, separates a vapor–liquid mixture
  • a machine used to produce mechanically separated meat
• The historic Swedish company name AB Separator, common ancestor of Alfa Laval and DeLaval
• Air classifier, a mechanical device to separate components of air
• Community separator, a term of urban planning
• Separator (electricity), a porous or ion-conducting barrier used to separate anode and cathode in electrochemical systems, also known as diaphragm
• Planar separator theorem, a theorem in graph theory
  • Vertex separator, a notion in graph theory
• Geometric separator, a line that separates a set of geometric shapes to two subsets
• A synonym for "generator" in category theory
• A mathematical sign used to separate the integer part from the fractional part of a number. For example, the decimal point and the binary point
• A synonym for "delimiter" in computer parlance
• Orthodontic spacer, also known as orthodontic separators
• Four of the C0 and C1 control codes used in digital character encoding
• A song by Radiohead, off the 2011 album The King of Limbs
• In computing, a Printer separator to flag the start and end of jobs on a printer