A mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones, disrupting the communication between the phone and the cell-phone base station, effectively disabling mobile phones within the range of the jammer, preventing them from receiving signals and from transmitting them.

a program to develop an airborne electronic warfare system, as a replacement for the AN/ALQ-99 found on the EA-18G Growler military aircraft.

Max Jammer (מקס ימר; born Moshe Jammer,"Late Prof. Moshe Jammer" ; April 13, 1915 – December 18, 2010), was an Israeli physicist and philosopher of physics.

Quentin Tremaine Jammer (born June 19, 1979) is an American former professional football player who played twelve seasons in the National Football League as a cornerback for the San Diego Chargers and Denver Broncos, with whom he went to Super Bowl XLVIII.