Esperanto
People sometimes use the word "Esperanto" in a metaphoric way (not in its literal sense). They use it to say that something aims to be international or neutral, or it uses a wide mixture of ideas. They say the programming language Java is "independent of specific computer systems [e.g. Windows, Android] like Esperanto is independent of ... nations". Similarly, they call the font Noto "the Esperanto of fonts" because it tries to work well for every culture's writing.