Which acronyms do you want? There is a myriad (plethora - a ~LOT~) of them.
As for keyboard shorcuts, look in the root folder of the game, and you'll find "SH4_Q-Ref_Card_Back.jpg" and "SH4_Q-Ref_Card_Front.jpg" files, which are the old laminated cardboard inserts a person got with earlier versions of the game. Even with that, not all of the shortcuts are on it, such as moving the Sonar head with the <Home> and <End> keys, or a mouse wheel scroll. I cannot find the post, but someone a while back made a post with help from other SubSim members about some of the "missing" shortcuts...
"Cycle the tubes" just means to go through the tubes in-turn, such as you are on Tube 1, which if you then press the <W> key, you will "cycle" to Tube 2, which is then "selected", and you can do what you will with the torpedo depth or speed, or open the tube doors, etc. Press the <W> again, and you go to Tube 3, etc, until you get to the last Tube, and it will then "cycle" back to Tube 1. Some mods add cycling the rear tubes with the <E> key. The <Q> key opens and closes the selected tube doors.
