3 ms·

According to https://en.wikipedia.org/wiki/List_of_programming_languages https://en.wikipedia.org/wiki/List_of_programming_languages I is still free :-)

• owl57 7y ago
  Should we count PL/I?
• arethuza 7y ago
  That's because I is the same as SKK
  • v64 7y ago
    For those who'd like to know more: https://en.wikipedia.org/wiki/SKI_combinator_calculus https://en.wikipedia.org/wiki/SKI_combinator_calculus