The IK Code is an international standard which describes the degree of protection of a housing against mechanical impact. It consists of "IK" followed by a two digit number IK00 - IK11. The higher the number, the higher the protection. IK00 can withstand no impact while IK11 can withstand an impact with an impact energy of 50 Joule.
Typically security cameras have an IK10 rating which can withstand an impact with an impact energy of 20 joule.