The Masonic Square and Compass
The Masonic Square and Compass symbol with the letter "G" that stands for Geometry revealing the glory of God. The compass and square, as Lodges and rituals explain, are tools as lessons in conduct, ethics or morality.
The Square and Compasses (or, more correctly, a square and a set of compasses joined together) is the single most identifiable symbol of Freemasonry. Both the square and compasses are architect's tools, and are used in Masonic ritual as emblems to teach symbolic lessons. Some Lodges and rituals explain these symbols as lessons in conduct: for example, that Masons should "square their actions by the square of virtue" and learn to "circumscribe their desires and keep their passions within due bounds toward all mankind". However, as Freemasonry is non-dogmatic, there is no general interpretation for these symbols (or any Masonic symbol) that is used by Freemasonry as a whole.