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One can get capital letters as follows

 ToExpression@(Capitalize /@ Alphabet[])

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We know that E,I,N,D are functions of Mathematica but what about K,C,O? they have no options and FullDefinition shows that they are protected only. why is that ?

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user49047
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1 Answers1

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From the documentation (MMA 12):

C[i] is the default form for the i[Null][Null]^th parameter or constant generated in representing the results of various symbolic computations.

O[x]^n represents a term of order x^n.

no idea about K, but I can actually use it as a symbol (it's not protected).

Fraccalo
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