Full text of Sir Gawain and the Green Knight
http://www.yorku.ca/inpar/sggk_neilson.pdf
The poem contains the first recorded use of the word pentangle in English (Oxford English Dictionary Online). The poem describes the pentangle as a symbol of faithfulness and an “endless knot”. The five points of the pentangle relate directly to Gawain in five ways: five senses, his five fingers, his faith found in the five wounds of Christ, the five joys of Mary (whose face was on the inside of the shield) and finally generosity, fellowship, chastity, courtesy, and charity (traits that Gawain possessed around others).