Question: While the ST Aero MAV-1 is a low observable Unmanned Air Vehicle prototype developed between ST Aerospace and Defence Science and Technology Agency, what is designed to avoid detection using a variety of technologies that reduce reflection/emission of radar, infrared, visible light, radio-frequency (RF) spectrum, and audio?
Context: A hot mirror is a specialized dielectric mirror, a dichroic filter, often employed to protect optical systems by reflecting infrared light back into a light source, while allowing visible light to pass.  Hot mirrors can be designed to be inserted into the optical system at an incidence angle varying between zero and 45 degrees, and are useful in a variety of applications where the buildup of waste heat can damage components or adversely affect spectral characteristics of the illumination source.  Wavelengths reflected by an infrared hot mirror range from about 750 to 1250 nanometers. By transmitting visible light wavelengths while reflecting infrared, hot mirrors can also serve as dichromatic beam splitters for specialized applications in fluorescence microscopy or optical eye tracking. The MAV-1 (Maneuvering Air Vehicle) is a low observable Unmanned Air Vehicle prototype developed between ST Aerospace and Defence Science and Technology Agency for its swarming unmanned air vehicle research programme.  The prototype was unveiled in Asian Aerospace 2004 and the first test flight was reported in 2005. Calorescence is when matter absorbs infrared radiant energy and emits visible radiant energy in its place.  For example, some kinds of flammable gas give off large amounts of radiant heat and very little visible light when burning, and if a piece of metal is placed into such a flame, the metal will become bright red-hot—which is to say the metal absorbs invisible infrared and emits visible radiation.  The word "calorescence" was coined in 1864 on the model of the word "fluorescence" which had been coined in 1852.  At that time, fluorescence was defined as absorption in the ultraviolet part of the spectrum followed by emission in the visible part of the spectrum.  Calorescence was defined complementarily as absorption in the infrared followed by emission in the visible. The FanTail is a Vertical Take-off and Landing (VTOL) Unmanned Air Vehicle developed by ST Aerospace. Stealth helicopters are helicopters that incorporate stealth technology to avoid detection.  Helicopters are in many ways less suitable for stealth technology than airplanes are, because of the noise generated by their rotor blades, which also give off a strong radar signature.  In recent years, designs for blades have emerged that can significantly reduce noise, which is a major issue for clandestine use of helicopters.  A raid on the compound of Osama bin Laden in May 2011 utilized what appeared to be two Sikorsky UH-60 Black Hawks, heavily modified for quieter operations and employing stealth technology to be less visible to radar. Stealth technology also termed LO technology (low observable technology) is a sub-discipline of military tactics and passive electronic countermeasures, which cover a range of techniques used with personnel, aircraft, ships, submarines, missiles and satellites to make them less visible (ideally invisible) to radar, infrared, sonar and other detection methods.  It corresponds to military camouflage for these parts of the electromagnetic spectrum (Multi-spectral camouflage). In infrared photography, the film or image sensor used is sensitive to infrared light.  The part of the spectrum used is referred to as near-infrared to distinguish it from far-infrared, which is the domain of thermal imaging.  Wavelengths used for photography range from about 700 nm to about 900 nm.  Film is usually sensitive to visible light too, so an infrared-passing filter is used; this lets infrared (IR) light pass through to the camera, but blocks all or most of the visible light spectrum (the filter thus looks black or deep red).  ("Infrared filter" may refer either to this type of filter or to one that blocks infrared but passes other wavelengths.) Brilliant (Zhuo-Yue Hao or Zhuyue Hao, 卓越号) Quadrotor UAV is a micro air vehicle (MAV) developed by a team of nine students headed by Mr. He Jiajun (何嘉俊) of School of Automation of Wuhan University of Technology (WHUT).  Brilliant Quadrotor is intended for various civilian and military missions, but it not yet known if it has entered service with Chinese military or law enforcement because Chinese official sources have not released any confirmation.  The MAV can either be remotely piloted or conduct autonomous flight, and GPS module is incorporated for navigation.  The complete name of Brilliant Quadrotor is called Intelligent Navigation Quadrotor Micro Unmanned Air Vehicle, Zhi-Neng Dao-Hang Si-Xuan-Yi Wei-Xing Wu-Ren Fei-Xing-Qi, 智能导航四旋翼微型无人飞行器). The Boeing Insitu RQ-21 Blackjack, formerly called the Integrator, is an American unmanned air vehicle designed and built by Boeing Insitu to meet a United States Navy requirement for a small tactical unmanned air system (STUAS).  It is a twin-boom, single-engine, monoplane, designed as a supplement to the Boeing Scan Eagle.  The Integrator weighs 61 kg (135 lb) and uses the same launcher and recovery system as the Scan Eagle. Stealth aircraft are designed to avoid detection using a variety of technologies that reduce reflection/emission of radar, infrared, visible light, radio-frequency (RF) spectrum, and audio, collectively known as stealth technology.  Development of stealth technology likely began in Germany during World War II, the prototyped Horten Ho 229 was designed for twin BMW 003 jet engines but finally powered by twin Junkers Jumo 004 jet engines being described as the first stealth aircraft.  Well-known modern examples of stealth of U.S. aircraft include the United States' F-117 Nighthawk (1981–2008), the B-2 Spirit, the F-22 Raptor, and the F-35 Lightning II.
Answer: Stealth aircraft