Figure 1. a. Fixed point: a point that a system evolves towards, such as the final states of a damped pendulum. b. Limit cycle: a periodic orbit of the system that is isolated. Examples include the swings of a pendulum clock and the heartbeat while resting. c. Limit-torus: there may be more than one frequency in the periodic trajectory of the system through the state of a limit cycle. If two of these frequencies form an irrational ratio, the trajectory is no longer closed, and the limit cycle becomes a limit torus. d. Strange attractor: it characterizes the behavior of chaotic systems in a phase space. The dynamics of satellites in the solar system is an example. This figure shows a plot of Lorenz's attractor.