Spectrum (FFT)
Oscilloscope
Mathematical Model
Standard Convention:
x(t) = r(t) * cos(q*t)
y(t) = r(t) * sin(q*t)
z(t) = -sin(p*t)
where r(t) = cos(p*t) + 2
p = Meridian (Small Rotation)
q = Longitude (Big Rotation)

Torus Knot Lab

TREFOIL
T(2, 3)