Fraternal symbols on Time covers 9: Triangle

Sep 2 1952

Oct 3 1949

The triangle and square which are most often used in masonry in their most famous symbol, the compass and the square, can be seen in the top image. For more on the significance of this see this link.
http://www.phoenixmasonry.org/47th_problem_of_euclid.htm

If you look closely at the top image you will even see the phallic Egyptian obelisk inside the triangle!