What does T stand for in physics waves?

Hint :Oscillation is the periodic fluctuation of a measure around a central value (often a point of equilibrium) or between two or more states, usually in time. Mechanical oscillation is exactly described by the term vibration. A swinging pendulum and alternating current are both instances of oscillation. Oscillations occur not just in mechanical systems, but also in dynamic systems in almost every field of research, such as the human heart's beating (for circulation).

Complete Step By Step Answer:
Simple harmonic motion (abbreviated SHM) is a form of periodic motion in mechanics and physics in which the restoring force on a moving item is directly proportional to the size of the object's displacement and operates towards the object's equilibrium position. It causes an oscillation that, if not interrupted by friction or other energy dissipation, can last eternally. Simple harmonic motion may be used to simulate a wide range of movements, but it is best shown by the oscillation of a mass on a spring when it is subjected to Hooke's law's linear elastic restoring force. The motion has a single resonance frequency and is sinusoidal in time.
The letter ‘T' is often used in physics to represent the period of oscillation (usually referred to as simply ‘period'). The interval between one wave and the next passing over the same location is known as the period of oscillation. It is generally represented in seconds as a unit of measurement. The frequency of the wave is the inverse of the period of oscillation.
The time it takes for one complete cycle of vibration to pass a specific location is called a time period (abbreviated as 'T'). The time period of a wave reduces as the frequency of the wave rises. 'Seconds' is the unit of time measurement. The reciprocal connection between frequency and time period can be represented mathematically as\[T{\text{ }} = {\text{ }}\dfrac{1}{f}{\text{ }}\].

Note :
The number of times a recurring event occurs per unit of time is known as frequency. It's also referred to as temporal frequency to distinguish it from spatial frequency, and ordinary frequency to distinguish it from angular frequency. The unit of frequency is hertz (Hz), which equals one occurrence per second. The period is the reciprocal of the frequency since it represents the length of one cycle in a recurring occurrence.