Initialism: occupational health and safety.

• Workplace safety and worker health systems, policies, and regulations.

Plural of OH (abbreviation with context-dependent meanings).

• Multiple instances of the symbol or abbreviation OH.

Plural of oh, the interjection expressing surprise or acknowledgment.

• Multiple spoken instances of the utterance oh.

Third-person singular simple present of oh.

• He/she/it says “oh.”