ykTykT

ykTykT is a fictional esoteric programming language (esolang) created as a minimalist model for exploring instruction-set design. In its standard description, programs consist solely of the three characters y, k, and T and are executed on a simple data tape.

The language operates on an unbounded tape of 8-bit cells initialized to zero, with a data pointer starting at the first cell. The three commands have the following core meanings: y increments the value in the current cell (mod 256), k moves the data pointer one cell to the right, and T outputs the current cell’s value as an ASCII character. Although the base model has no native loops, repeating patterns can simulate iteration in practice, and many extended variants introduce additional control-flow constructs.

Because of its tiny instruction set, ykTykT is discussed in code-golf and puzzle contexts as a teaching example of how computation can arise from very small grammars. Implementations vary, and some descriptions include alternative interpretations of the commands or additional extensions for input, subtraction, and looping.

Origin and reception: The term first appeared in online esolangs discussions in the mid-2010s as a thought experiment rather than a widely adopted language. It remains a niche topic, referenced mainly in demonstrations of minimalistic language design and in speculative discussions about program size.

See also: Esoteric programming language; Brainfuck; Code golf; Minimalist programming languages.