In Western esotericism as well as in ancient China, the compass, which is usually associated with the square, is an important cosmological symbol. It is used to measure and draw circles, while the square to check the accuracy of the 90° angle . Legists say that in the square and compass the perfection of the angle and the circle is contained.

The letter G is a Masonnic symbol, which is found in the Fellowcraft degree, occupying the center of the Blazing Star. Some argue that the letter 'G' stands for GEOMETRY, the basis of the operative craft that gave birth to modern Freemasonry,the science of the Great Architect of the Universe.