what virtues of chivalry are represented by the pentangle?

The pentangle is also known as "the endless knot." The five points represent the five virtues.

"These five ways are in themselves five groups of five: 1) he is perfect in the five senses; 2) his five fingers are unfailing; 3) his faith is fixed firmly on the five wounds which Christ received on the cross; 4) he draws his strength from the five joys Mary had through Jesus; and 5) he embodies, better than any other living man, the five virtues. These virtues are Franchise, Fellowship, Cleanness, Courtesy, and above all, Charity."