A.R.R., anno regni regis or reginæ= In the year of the king's or queen's reign.
A.R.S.A. Associate of the Royal Scottish Academy; Associate of the Royal Society of Arts.
A.R.S.L. Associate of the Royal Society of Literature.
A.R.S.M. Associate of the Royal School of Mines.
A.R.S.S., Antiquariorum Regiæ Societatis Socius=Fellow of the Royal Society of Antiquaries.
art. Article; Artillery.
A.S. Anglo-Saxon; Anno salutis=In the year of salvation; Assistant Secretary.
Asaph. Of St Asaph.
A.S.E. Amalgamated Society of Engineers.
Ass., Assoc. Association.