Ball

In automotive and engineering contexts, “ball” refers to:

1. A sphere usually made of metal: This could refer to bearings, such as ball bearings, which are critical components in automotive systems for reducing friction between moving parts.
2. A circular traffic light: In US highway traffic engineering terminology, a “ball” refers to a circular traffic light used to control traffic flow with green (go), amber (prepare to stop), and red (stop) signals.

These terms are specific to their respective applications and are important in ensuring safety and efficient operation in automotive and traffic control systems.

See

• Ball and spring
• Ball bearing
• Ball joint
• Ball joint rocker arm
• Check ball
• Detent ball and spring
• Discharge Check Ball
• Hitch ball
• Impact swivel ball universal joint
• Pump Inlet Check Ball
• Recirculating-ball-and-nut steering
• Recirculating ball steering
• Recirculating ball worm and nut
• Towing ball