What are sounds below 20 Hz called?

Related questions

1. What are sounds above 20000 Hz called?
2. What is a good Hz range for speakers?
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5. Do ultrasonic sounds hurt dogs?
6. What Hz should subwoofer be set at?
7. What are higher frequency sounds?
8. What is an example of a low frequency sound?
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Tags

1. #normally
2. #ultrasound
3. #between
4. #frequencies
5. #hertz
6. #human
7. #called
8. #above
9. #beings
10. #infrasound
11. #sounds
12. #frequency
13. #pitched
14. #about
15. #below
16. #humans