Sir  Gawain's  Pentangle!
Sir Gawain's sign, the pentangle.
The pentangle was|
"a sign by Solomon sagely devised
To be a token of truth, by its title of old,
For it is a figure formed of five points,
And each line is linked and locked with the next
For ever and ever, and hence it is called
In all England, as I hear, the endless knot." Norton, 215