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I presume mean the "fine structure constant," which is abbreviated as alpha.

It is the ratio of the square of the electric charge, divided by Planck's Constant and the speed of light. It has no units, and thus does not depend on which system of units you are using. More importantly, it involves all three of the most fundamental numbers of our Universe.

Whether this number has any special meaning in our Universe is still a matter of discussion. It may be nothing more than a unit-less ratio of three fundamental numbers, with no meaning beyond that fact.

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Q: What is the Alpha constant?
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