ARCM is the abbreviation of the diploma qualification Associate of the Royal College of Music and the post-nominal letters a holder is entitled to use. Like the LRAM it was formerly offered in a teaching or performing version, but unlike the latter it is no longer available.
There is no obvious successor to the ARCM, since the College's undergraduates now follow a BMus(Hons) course accredited by the College itself; although in 2012 approximately a quarter of the academic staff included ARCM in their lists of qualifications.  When the basic graduate course led to the GRSM "graduate diploma" a condition of graduating was an ARCM pass in Teaching or Performing, achieved no later than a year before graduation.
Those awarded the diploma are entitled to use the post-nominal letters ARCM and to wear the appropriate academic dress: black bachelors' gown with a royal blue silk hood of simple shape, the cowl part-lined 3 inches and bound 1/4 inch with old gold silk, the neckband fully lined and bound 1/4 inch of old gold silk.