This little website shows you the constant symbol and, where applicable, the numerical value of a mathematical or physical constant.

Just choose a constant:

Here is a random symbol:

Classical Electron Radius

Classical Electron Radius can be represented by the symbol:

Its value is:

2.817940285 × 10

-15

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We're always adding new constants and symbols to the database, and would love to hear your suggestions. What are we missing?