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  1. (arts, Britain) Initialism of Royal Society of Arts.
  2. (Australia, hospitality) Initialism of Responsible Service of Alcohol. (a qualification and permit for bar staff)
    • 1999, Linda A. Jerris, Human Resources Management for Hospitality[1], page 516:
      The Responsible Service of Alcohol (RSA) is more than just a training course. It is a complete system which includes training, testing, reporting and operational policy and procedures support.
    • 2007, Transitions Abroad, Volume 30, Issues 4-6, page 65,
      Note that it may be necessary to acquire a certificate, for example the RSA (Responsible Service of Alcohol) and/ or RCG (Responsible Conduct of Gambling) before being eligible for employment on licensed premises.
    • 2007, Peter Rix, Marketing: A Practical Approach[2], page 3:
      Add in tighter RSA (responsible service of alcohol) and the need to control crowd behaviour, and you can see it′s a fine line we have to tread.
    • 2008, George Dunford, Matthew D. Firestone, Anthony Ham, The Big Trip: Your Ultimate Guide to Gap Years and Overseas Adventures, Lonely Planet, page 127,
      In Australia, for example, many employers require you to complete a Responsible Service of Alcohol (RSA) course, a six-hour course about when to stop serving customers who have had a little too much.
  3. (cryptography) Initialism of the Rivest-Shamir-Adleman encryption algorithm.
  4. (politics) Initialism of Republic of South Africa.