Kiska

The Kiska was the standard issue grenade used by the Japanese forces during World War II and is featured in Call of Duty: World at War.

Call of Duty: World at War
In single-player campaign mode, you can pick these up from dead Japanese soldiers in the Marine Raiders campaign. These grenades are not available in multiplayer, splitscreen or online, but they can be used in online custom matches if you select to play as the Japanese, as online custom matches only allow you to use weapons by country.

Trivia

 * Throughout the Pacific campaign, you will sometimes come across soldiers who will commit suicide using this grenade. An example of this is the soldier in Little Resistance.