Audiodisc is a Swedish media manufacturer producing optical discs and previously, vinyl records and cassettes.
Runouts on records cut and pressed by Audiodisc often include the abbreviation "AD" and a 6-digit cutting or plating date (YYMMDD)
On some releases there's a signature after the date looking like "☧". This signature probably belongs to a plating engineer at Audiodisc, but the identity is still unknown.

Founded in 1983 by the original owner and founder of AB Svensk Grammofonindustri, Tage Andersson, and was initially run by his son Torbjörn Andersson.
Audiodisc moved into SGI's old factory in Stockholm and would operate there until moving to Bålsta in 2007.