PS Review of Freemasonry is the oldest, most popular and famous Freemasons' online publication written by Master Masons of a Grand Lodge of Ancient, Accepted Free Masons. Freemasons recognized as regulars by the United Grand Lodge of England or by a Grand Lodge of the United States of America, Prince Hall Masonry included.
http://www.freemasons-freemasonry.com/
Geometric properties of masonic symbols
http://www.freemasons-freemasonry.com/freemasonry_geometry.html