Type 14 Magnetic/Anti-Tank Mine

The Type 14 Magnetic/Anti-Tank Mine is a UNSC explosive ordnance. This is also used as "the bomb" in Assault-type games from Halo 2 and Halo 3.

Background
It is used as both a mine and a satchel-charge type bomb. The arming fuse can be set for five, ten, or fifteen seconds, and since inside it's packed with 6.8 kg of C-7, it has a colossal area of devastating effect. The magnetic attachment device ensures that it will adhere to a vehicle which passes over it. It is used exclusively in Halo 2 and 3 multiplayer matches, and is not featured in any campaigns or in any novels.

Messages
The messages seem to correspond to what map is used.

For instance, the message "Thus I Refute Thee", appears on the maps Ivory Tower, Waterworks, Turf, Backwash, Elongation, Relic, Foundry and Last Resort. A similar description of the bomb is present on Bungie.net's matchmaking stats section, of the service record. "Hold Onto Yer Butt" appears on Ascension, Burial Mounds, Warlock and Gemini.

"Kiss It Goodbye" on Coagulation, Headlong, Sanctuary, Terminal, Tombstone and Foundry as well.

A hieroglyph of a Spartan helmet, the "V for victory" hand gesture, then xoxo & hearts; appears on Lockout, Midship, Beaver Creek, Colossus, Zanzibar, Foundation, Containment and on Desolation.

Trivia

 * Additionally, it is used to portray Andy in the machinima series Red vs. Blue.
 * It has been remade for use in several custom maps on Halo: Custom Edition, behaving similar like an Assault Bomb. It has both a fifteen-second fuse and a five-second fuse.
 * Oddly, even though it is UNSC equipment, it is named similarly to Covenant vehicles and weapons (type ##).