1. Tennis Professional Players Association (ATP) was established in 1972, with the goal of protecting the interests of male professional tennis players (female players later formed the Women's Tennis Federation).

2. Automatic train protection (ATP), also known as train overspeed protection system, is a system that automatically brakes when the train exceeds the specified speed.

3. Adenine nucleoside triphosphate (adenosine triphosphate) is an unstable high-energy compound, which consists of 1 molecular adenine, 1 molecular ribose and 3 molecules of phosphoric acid. Also known as adenosine triphosphate, ATP for short.

4. It is related to production and can be used in products.