Type 14 Magnetic/Anti-Tank Mine
From Halopedia, the Halo wiki
The Type 14 Magnetic/Anti-Tank Mine is a piece of UNSC explosive ordnance.
The Type 14 Magnetic/Anti-Tank Mine is used as both a mine and a satchel-charge type of bomb, containing 6.8 kilograms of C-7 foaming explosive. The arming fuse can be set for five, ten, or fifteen seconds. The magnetic attachment device ensures that it will adhere to a vehicle that passes over it. It is used exclusively in Halo 2, Halo 3 and Halo: Reach multiplayer matches, and is not featured in any campaigns or in any novels.
In Halo: Reach Invasion gametypes, players playing as Covenant Sangheili utilize a similar plasma-based bomb for similar purposes.
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