Comment by jorkingit

I did take some inspiration from Unlambda: the prefix application syntax is cool! I/O in Unlambda is super weird though! You get a read character instruction that puts it into a character register where the only thing you can do is compare it or print it out again; I don't think you can actually do any arithmetic on it.

I'm not sure if I would characterize Brainfuck as a stack language, but I suppose if you considered all the operators to be unary stack operations I could see it!