A Type-V phaser was a type of phaser emitter capable of being installed on Federation Starfleet spacecraft.
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In the 2360s, Federation shuttlecraft classes such as the Type-7 and Type-9A, while normally unarmed, could be fitted with up to two emitters of this type for special missions. (TNG reference: Star Trek: The Next Generation Technical Manual, Decipher RPG module: Starships)
In the 2370s, Federation shuttlecraft classes such as the Type-10 and Flyer-class were equipped with a number of phaser arrays consisting of multiple emitters each of this type. (Decipher RPG module: Starships)