What Does X Terminal Mean?

An X terminal is an input terminal with a display, keyboard, mouse and touch pad that uses X server software to render images. Used as an open-source windowing system known as the X Window System, the X terminal does not perform application processing - this is handled by the network server.

Techopedia Explains X Terminal

In X, the terms client and server are used from the software’s perspective. Thus, the X server supplies a screen, keyboard, mouse and touch pad to client applications. The X terminal uses a Unix-based operating system residing on a mainframe, minicomputer or workstation.