ABC

ABC is an abbreviation with at least four meanings:

• The Roman alphabet, of which A, B, and C are the first three letters.
• Atomic, biological, and chemical warfare. A - [atomic warfare]? (see nuclear weapon). B: biological warfare. C: [chemical warfare]?. This abbreviation has largely been superseded by NBC, where the "N" stands for "nuclear".
• The television network [American Broadcasting Corporation]?.
• The television network [Australian Broadcasting Corporation]?.