What is Government Spin-off?

Legal Definition
Government spin-off is civilian goods which are the collateral result of military or governmental research. One prominent example of a type of government spin-off is technology that has been commercialized through NASA funding, research, licensing, facilities, or assistance.

NASA spin-off technologies have been produced for over forty years. The Internet is a specific example of a government spin-off resulting from DARPA funding. But in the years since the Moore's law driven commercial sector with yearly timeframes has jumped ahead of the defense sector's decade long timeframes to the extent that new "spin-on" Commercial off-the-shelf products are now applied for defense platforms.
-- Wikipedia