BLUE LODGE
In the jargon of Freemasonry, a lodge working the three fundamental Masonic degrees of Entered Apprentice, Fellow Craft, and Master Mason. Blue is the symbolic colour of these three degrees, while other degrees have their own distinctive colours; the Royal Arch and its associated degrees, for example, have red for their colour. See Freemasonry; Royal Arch.
SOURCE:
The Element Encyclopedia of Secret Societies : the ultimate a-z of ancient mysteries, lost civilizations and forgotten wisdom written by John Michael Greer – © John Michael Greer 2006