Other Uses
- Ar. also used for salutation for Professional Architect
- AR-15, a rifle
- Accounts Receivable, an accounting term
- Aerolíneas Argentinas (IATA code)
- Alfa Romeo, automobile
- Assistant referee (association football)
- Arabic language (ISO 639 alpha-2 language code)
- Argentina (ISO 3166-1 alpha-2 country code)
- Autoregressive model, concerning random processes in statistics
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