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Re:Introducing Sodium, a new cryptographic library by qznc on Thursday March 07, 2013 @01:48AM (#5336483)
C, D, R, Io, ...

Most single letters are taken for programming languages. http://en.wikipedia.org/wiki/List_of_programming_languages

Re:Introducing Sodium, a new cryptographic library by ics on Thursday March 07, 2013 @02:36AM (#5336609)
The APL guys had it figured out.