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    $\begingroup$ Why can't you use a1, a2, a3... b1, b2, ..., z1, z2, ... aa1,... ab1...? You have an infinite pool of symbols! $\endgroup$ Commented Feb 3, 2014 at 16:34
  • $\begingroup$ How to define an order relation on your set? $\endgroup$ Commented Feb 4, 2014 at 9:23
  • $\begingroup$ There seems to be a sort of side-question (which @rm-rf may want to weigh in on) where you want to use subscripts in "looping constructs" and to make things "visually appealing". For the latter, you can convert at the end to whatever presentation you want. For the former, it might be better to use things like a[1], a[2],... but maybe this is worthy of a search and possibly a separate question about the best way to handle indices for the looping constructs you have in mind. $\endgroup$ Commented Feb 5, 2014 at 4:15
  • $\begingroup$ @ Mark S. Well, have you tried before suggesting? "Things like a[1], a[2], ... " do not work either ... A suggestion of rm -rf does work, but, as I said, additional work must be invested in implementing looping with these variables. I do not say that suggestion rm -rf is not a plausible solution: It is just preaching instead of answering a precisely formulated question. $\endgroup$ Commented Feb 5, 2014 at 10:03