ISOMAGNETIC DISINTEGRATOR
Shoulder-mounted large caliber engery weapon. This could in reality be the Tetryon Pulse Launcher, in which case the Isomagnetic Disintegrator remains unidentified; either it hasn't been seen, or it is the correct term for what we've been calling the
First Contact Type-III Phaser Rifles.
I'd say the Tetryon Pulse Launcher was the Worfzooka, while the Isomagnetic Disintegrators were the rifles. I remember the old sci-fi TV "disintegrator" weapons always inferring a beam or ray that disintegrated its target. The rifles fired beams as well as short beam pulses. On the other hand, the Wolfzooka only launched a pulse.
In the yacht scene, "ten isomagnetic disintegrators and eight tetryon pulse launchers" were taken onto the yacht, along with some explosives. No mention was made of any other weapons. The rifles were the most used weapons, but were not mentioned? Let's face it, the term "launcher" seems to fit the Worfzooka pretty good, but doesn't fit the rifle at all. And, by more traditional use of the term "disintegrator," the reverse is true.
I think the
Star Trek Encyclopedia guys got it wrong. They assumed the rifle was a phaser based on Worf's barked order, "Phasers ready!" in
First Contact. When this weapon showed up, they seemed to have a choice between two terms, and picked the wrong one.
It would appear that the Worfzooka lives on, at least in redressed form--it is identical to certain parts of the
Argo's weapon in
Nemesis.