Barrule is a Mountain on the Isle of Man.
TheBarruleKnot is one is one line that crosses itself 6 times. This can be written 1:2:6. [1 line, 2 petals & 6 crossings].
Triangular Knots might have a SN: 1:3:x
Square Knots might have a SN: 1:4:x
Star Knots might have a SN: 1:5:x
‘SN:’ stands for Structural Number.
SN: 1:2:6