Question: What is O3 (O followed by the number 3, usually shown in sub-script)?
Answer: Ozone generator; Smell of electricity; Electricity smell; O₃; Electric smell; Ozone; Ozone in water; Activated Oxygen; Ozonator; Ozonation; Ozonizer; Activated oxygen; Ozoneator; Oxygen 3; Triatomic oxygen; Ozone Chemical; Trioxygen