PHILCO

from Fancyclopedia 2

Philadelphia Conference; one of the annual gatherings held, usually in November, in Philadelphia under the sponsorship of the PSFS . The title was adopted in 1939 when "convention" had come to mean something larger than the former Eastern SF gatherings, but the annual PhilCos (the longest con-series in fandom) are numbered serially counting the First and Third Easterns as 1 and 2.