rose

The explanation is:

the white pentagon (upside down) inside the red pentagon (right side up) represents the spirit descending into the heart. This is the sacred mystery of the Catholic dove and the heart. The five sides of the red pentagon represent the five interior muscles of the heart (the four valves of the left and right atrium and ventricals and the aorta). The green star within is a mystery of myseries, not to be communicated yet at this degree. If asked about the green star by a priest explain it is the fifth of five, the other four being yellow, and that it is a symbol of Christ alive and uncrucified. If asked about the Green Star by anyone of a lesser degree than priest, explain to them it pertains to the saying "every rose has its thorn."