π = 3.1415926535 . . . can never reach 4, and this makes π infinite.
The number π belongs to a circle or a sphere.
The number π appears in many physical theories.
According to Einstein's SRT, quantum particles cannot have
a solid structure, that is, a quantum-circle or a quantum-ball
cannot be solid.
This means that quantum particles vibrate, vibrate constantly.
This opinion is not abstract.
"String particles" also vibrate constantly.
What is the difference?
The formula (symbol) for "string particles" does not appear
in quantum equations, but π = 3.1415 ... is in many equations.
And therefore a vibrating particle 'π' can have an energy E=h*f
(due to its own, internal spin)