Chat abbreviation for "of course".

• Expresses obvious agreement or certainty.

Fandom term: "original female character".

• A female character created by the author, not canon.

Abbreviation for "officer" in titles or reports.

• Used in law enforcement or military contexts.

Initialism for "oxygen-free copper".

• High-purity copper used in audio, power, or vacuum systems.

Initialism for "orbitofrontal cortex".

• A prefrontal brain region for valuation and decision-making.