Mirah (formerly known as Duby) is a programming language based on Ruby syntax, local type inference, hybrid static/dynamic type system, and a pluggable compiler toolchain. Mirah was created by Charles Oliver Nutter to be "a 'Ruby-like' language, probably a subset of Ruby syntax, that [could] compile to solid, fast, idiomatic JVM bytecode." The word mirah refers to the gemstone ruby in the Javanese language, a play on the concept of Ruby in Java.