Metric Entropy
Also known as Kolmogorov Entropy, Kolmogorov-Sinai Entropy, or KSEntropy. The metric entropy is 0 for nonchaotic motion and 
for Chaotic motion.
References
Ott, E. Chaos in Dynamical Systems. New York: Cambridge University Press, p. 138, 1993.
- Dragon Curve
- Dragon Fractal
- Draughts
- Drinfeld's Symmetric Space
- Droz-Farny Circles
- Drum
- D-Statistic
- D-Triangle
- Dual Basis
- Dual Bivector
- Dual Graph
- Duality Principle
- Duality Theorem
- Dual Map
- Dual Polyhedron
- Dual Scalar
- Dual Solid
- Dual Tensor
- Dual Voting
- Du Bois Raymond Constants
- Duffing Differential Equation
- Duhamel's Convolution Principle
- Dumbbell Curve
- Duodecillion
- Dupin's Cyclide