An annunciator is a device used for signaling the condition or status of a process or machine by means of illuminating the section of a display containing the text and/or graphics associated with the current alarm, fault or other condition. An annunciator window is the piece that can be illuminated in an annunciator, and usually consists of a translucent piece of plastic or glass containing engraved, printed or applied text and/or graphics in a contrasting color.