'mispar/{gadol|katan|siduri|bone'eh|kidmi|p'rati|ha-merubah ha-klali|meshulash|ha-akhor|mispari|ne'elam|katan mispari|musafi}' as well as 'otiyot/be-milui', and 'kolel'
You can then also have #includes or pre-processor directives such as:
#include Atbash (opposites), Albam and Achbi (two 11 letter alphabets), Akhas beta (three groups [778]), Ayak bakar (letter*10), Ofanim (last letter replace), Avgad (letter++)
And if you really want to, you can do all the other parts of 'math' like polynomials, curve fits, blah, blah, just with letters.
Is it just
or am I missing something?