AOC

• aerodrome obstacle chart (followed by type & name/title)

  ICAO

• airport operating certificate

  General

AOC has 2 meanings; the right one depends on context. A weather report, a NOTAM or an ATC clearance. Got a NOTAM full of contractions? Paste it into the decoder.

Source: FAA Order JO 7340.2 Contractions. Not for operational use.