Veteran players are prone to using abbreviations. Since they have used them for long times, they don't seem to believe anyone might not know them. Here are the most common ones, so your commander starts making sense.
Ships
Bases
Weapons
Actions
Map Locations
Sector names for HiHigher, one of the more commonly played maps.
The sector names are randomly generated each game. To help coordinate attacks and defense quickly, veterans refer to sectors by where they appear on the minimap. For example "High" refers to the top of the map, "Left" as ones on the left, "Home" as the sector your first base started in, etc.
See Also
The full list of abbreviations