Arch. Archibald.
arch. Archaic.
archæol. Archæology.
arch., archit. Architecture.
Archd. Archdeacon; Archibald.
arg., argentum=Silver.
A.R.H.A. Associate of the Royal Hibernian Academy.
arith. Arithmetic or Arithmetical.
Ark. Arkansas.
Arm. Armenian; Armoric.