What are the three parts of a pendulum? describe each one

Pivot point: It is the point around which pendulum oscillations occur.
 Rope: Is one that is between the pivot point and the mass m. Thanks to the tension of the rope and its length, it is possible that oscillations of the pendulum occur.
 Mass: is the one that is placed on the end of the rope of the pendulum.
 The period of a pendulum is:
 T = 2 * pi * root (l / g)
 where,
 l = length of the rope
 g = gravity