The metasyntax convention of these formal metalanguages are not yet formalized. The act of working with metalanguages in programming is known as "metaprogramming". Wierzbicka and colleagues refer to all the natural semantic metalanguages as 'isomorphic' with each other. B. This is a specific characteristic of these metalanguages being programming languages. Natural language combines nested and ordered metalanguages. Natural language demonstrably contains its own metalanguages, in which we talk about language itself. Terminals, nonterminals, and metasymbols do not apply across all metalanguages.