What does PX stand for in coding?

Related questions

1. What is em to px?
2. What is EM in HTML?
3. What is EM in padding?
4. What is EM condition?
5. What is EM Web design?
6. What does PX mean?
7. What does em mean prefix?
8. What does em and REM stand for?
9. What Is REM and em?
10. Which is better EM or REM?

Tags

1. #equal
2. #authoring
3. #useful
4. #background
5. #image
6. #quantity
7. #concerned
8. #pixel
9. #definition
10. #unscaled
11. #length