AR-558 was the only answer that was not the designation of a weapon but a planet. The EM-33 was a Plasma Pistol issued to Starfleet personnel in the 22nd century and the CRM 114 was a directed energy weapon manufactured by the Breen. But the TR-116 was a hand-held projectile weapon developed by Starfleet Security as a contingency for use in dampening fields or radiogenic environments and the weapon of choice for Science Officer Chu'lak, who used it to murder fellow Starfleet officers on DS9.

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The Sheliak are a species which prefers the room temperature to be the same as their body temperature, as Data explains during his attempt at small talk.