Omega, to physicists, is the last letter of the Greek alphabet and is often used to represent the end of a series or sequence. It is also used to symbolize the concept of infinity, as it is the last letter in the alphabet. In physics, omega is used to represent angular frequency, which is the rate of change of an angle with respect to time. Omega is also used to represent the specific heat capacity of a material, which is the amount of energy required to raise the temperature of a unit mass of a substance by one degree Celsius.