Stealth technology
Stealth technology also known as LOT (Low Observability Technology) is a sub-discipline of military (like Army, Navy, Air Force, Marine, Coast Guard and National Guard in the North American United States) electronic countermeasures which covers a range of techniques used with aircraft, ships and missiles, in order to make them less visible.
For example, stealth technology was developed to make aircraft difficult to detect with radar.
Stealth Technology Media
Surcouf, a French stealth frigate
The F-35 Lightning II offers better stealthy features (such as this landing gear door) than prior American multi-role fighters, such as the F-16 Fighting Falcon
YF-23 S-duct engine air intake conceals engine from probing radar waves
Template:HSwMS, a stealth ship
Skin of a B-2 bomber.
Slit shaped tail exhaust Northrop Tacit Blue