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First of all the "letter" 2 is actually a number. The 2 in E=mc2, stands for squared or to the power of 2. Meaning that you times the value of c, the speed of light in a vacuum (2.9979 x 108 meters per second ), by itself.

That's simply 2.9979 x 108 x 2.9979 x 108.

(Which gives 8.9874 x 1016.)

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Q: In Albert Einstein's famous formula E mc2 what does the letter 2 stand for?
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