Ok .. let's define .. with an aircraft, that's easier.
Let's start with aircraft going straight and level.
If it points nose down or up (pushing or pulling stick) I call that pitching.
If the aircraft turns left and right only I call tad turning or yaw.
If wing on one side goes down and on the other side up without change in direction or or altitude, I call that rolling. Or banking. With ships the term listing is sometimes used too. Aircraft can perform maneuver called 'roll' where it rotates 360 degrees without changing direction or altitude like this.
All maned vehicles use fixed bank. Just because people are inside and they want to sit or something. So even if plane can turn upside down, except for acrobatic flying or dogfight they don't do that. Same for subs.
With torpedo (or AA missile for example) there is no much need to keep constant roll. While it could be useful to avoid fast rolling, which could complicate seeking, there may be no need to keep one side always up. On the other hand with those gyros inside, it would not be problem to do so.
The question is: can torpedoes go upside down ? Can they roll ? Do they prevent it somehow ?
I ask only for realism sake for my simulator. It's no big deal.
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