Period equation, T=I/f, what does I mean

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In the equation T=I/f, "I" represents the number one, simplifying the formula to T=1/f. This indicates that the period (T) is the reciprocal of the frequency (f). Understanding this relationship is crucial for grasping the concepts of periodic motion. The equation can also be expressed as f=1/T, highlighting that frequency is the number of cycles per second. Mastering these fundamental equations is essential for physics studies.
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I am doing a home project for my Physical science concepts class. i need to find the period of a pendulum's swing. the prof. gave us the formula, T=I/f and tells us that T is the period, and f is the frequency of the swing, but doesn't say what I is. Does anyone know?
 
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"I" is really "1", i.e. the number one.

T = 1/f​
 
Thank you. :-)
 
It's important to understand equations intuitively. T=1/f can be rewritten as f=1/T. 1/T is the number of periods that can fit within 1 second of time. By definition, that's the frequency.
 

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