Im with Enkidoh, no idea what that spire thing was about. If it is the AST ability, i think it only lasts like 30 secs and can only be used on group members... so... maybe some sarcasm from someone? That terminology list is fine, though you really never see some of them. The dungeon abbreviations in particular are mostly filler, as only a very select few of them are focused on enough to warrant the attention. I might be too tired to think meta right now, so sorry but i cant help there.

As for courtesies... In instances most people wait for the healer to buff the group(protect and maybe stoneskin) before they start to run off. Always let the tank pull, and even if you think he's going too slowly dont "help" by grabbing the next group. As a ninja you have more potential support abilities then other melee classes, so learn to use them well(goad, trick attack, smokescreen, shadewalker, etc). On most boss battles your limit break will end up being the best one to use, so get a feel for how long that takes to cast at the different charge levels and the right/wrong times to trigger it.

Im sure there are a few other good ones, but im growing tired and no longer thinking straight, so i think ill end there for now. Good luck, and continue enjoying the game!