The MS-09 Dom (MS-09ドム, Domu) (aka MS-09B Dom) is a mass-production ground combat mobile suit introduced in the anime Mobile Suit Gundam. Its most well known pilots are the Black Tri-Stars.

A heavy mobile suit developed by Zimmad, the MS-09 Dom was a ground combat machine equipped with hovercraft technology. It was fitted with thermonuclear jets and rockets under its feet, allowing it to quickly move across the ground, greatly improving its mobility compared to previous ground-use mobile suits. Thanks to sensors located in front of its feet, it was able to traverse uneven terrain. While in cruising mode, it could hover across the ground using only its thermonuclear jets. The Dom can hover at a maximum speed of 381 km/hr for up to 5 hours.

Its primary thrusters adopted the Saturn Engine, a type of thermonuclear engine that used heavy elements such as zinc and lead as propellant, granting it higher thrust than thermonuclear engines that used lighter elements as propellant. The mobile suit's design was largely unchanged from the YMS-09 Prototype Dom aside from its appearance.It inherited the same cross-shaped monoeye rail from the MS-07C-5 Gouf Test Prototype, granting it an improved view of aerial targets.Lateral field of view was obtained by auxiliary sensors.

For defense, the Dom was heavily protected, adopting a unique "skirt armor" design to protect weak points in the back such as thrusters, and the suit was mockingly called Skirted (スカート付き, Sukāto-tsuki) by Federation pilots as a result. Its cockpit hatch armor, which was its greatest weakness in the front, was also greatly enhanced. However, since the cockpit was entered directly from the front of the Dom, pilots in desert and wetland areas complained that the console panel would become dirty from entering and exiting. Meanwhile, the Dom's head was merged into its chest, a design intended to deflect and ricochet enemy projectiles, as well as lowering the possibility of being hit.

The Dom's primary weapon, the 360mm Giant Bazooka, was developed in parallel with the mobile suit. It was capable of sinking a space cruiser with a single shot.It was also armed with a heat saber for close combat, as well as a scattering beam cannon in its chest, which was capable of blinding the enemy. It was said that the beam cannon was originally intended to be an energy port for beam weapons, but was repurposed after the development of beam weapons was delayed

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