A black box is a device, object, or system whose inner workings are unknown; only the "stimuli inputs" and "output reactions" are known characteristics. Black box may also refer to: Science and technology Black box (phreaking), a device to defeat telephone toll charges Eucalyptus largiflorens, a tree species with the common name black box Transportation Accident data recorder, an optional vehicle installable device to record information related to (near) traffic accidents Event data recorder, a device installed in some automobiles to record information related to vehicle crashes or accidents Flight recorder, an aircraft-borne device used in disaster investigation, consisting of a flight data recorder and cockpit voice recorder Flight operations quality assurance Quick access recorder Train event recorder, a device that records data about the operation of train controls and performance Voyage data recorder, a device designed to collect data from various sensors on board a ship Computing Black box theory, a systems engineering theory for black boxes Black-box testing, a form of software testing that involves adjusting inputs to an application without reference to the source code of the application Blackbox, a window manager that works on X Window System platforms BlackBox Component Builder, software development environment for Component Pascal Sun Modular Datacenter, prototype name Project Blackbox Medicine Any of a number of devices developed and sold by Albert Abrams, based on the pseudo-science of radionics Black box warning, a type of warning that may be applied to medicines in the United States Film and television Black Box (1978 film), an American short film by Scott B and Beth B Black Box (2002 film), an Argentine drama film (Caja Negra) Black Box (2013 film), an American drama film Black Box (2020 film), an American science-fiction horror film Black Box (2021 film), a Franco-Belgian mystery thriller film Black Box (TV series), a 2014 ABC television series Black Box (The Outer Limits), an episode from the 1995 revival of that TV series Survival in the Sky, a TV series on the investigations of aviation accidents known as Black Box in the UK The Black Box (2005 film), a French mystery film The Black Box (serial), a 1915 film serial Black Box (video magazine), a Hungarian documentary video magazine and filmmaking group Games Black Box (game), board and computer game Blackbox (video game), an iOS puzzle game EA Black Box, the video game studio formerly known as Black Box Games The Black