Some of the most commonly confused or confusing abbreviations are:
BB: This usually means "ButcherBlock (Mountains)", except for when it means "BlackBurrow".
SF: SkyFire (Mountains), in Kunark, unless of course the speaker meant "SteamFont (Mountains)", in Faydwer. (The Stonebrunt Mountains are on Odus, and are very often misspelled as the "Stoneburnts", but are abbreviated SB.)
SFG, on the other hand, means "SureFall Glade", near to and on the other side of the Qeynos Hills from Qeynos itself.
SG is more likely to mean "Siren's Grotto", which is the way between "Cobalt Scar" (CS) and the "Western Wastes" (WW) in Velious.
CS when described as "lousy" or "nonexistent" is, of course, a reference to (C)ustomer (S)ervice.
PC: means "Paludal Caverns", unless someone is asking for a "PC" on some item of equipment, in which case it means "Price Check". A third person will inevitably come along and refer to his "PC" meaning his computer.
NL: Probably means "Nedaria's Landing", unless someone means the "Netherbian Lair", instead.
DPS, as noted, stands for Damage Per Second, and is sometimes used (when groups are forming) to refer to a *person*, that is, a character, who can supply DPS. DSP, on the other hand, is "Dawn Shroud Peaks".
SS: might mean "SkyShrine", or could mean the city of "Sanctus Seru", on Luclin.
KC: This is the abbreviation for both "Karnor's Castle" and "Katta Castellum".
SolA, SolB, and SolRo are Solusek's Eye (named for the large caldera of lava outside), Nagafen's Lair (named for the Dragon inside), and the Temple of Solusek Ro (or Sol Ro Temple), respectively (all three found around the largest pool of lava in the Lavastorm Mountains). SolC is the 'Caverns of Exile', an instanced dungeon off of Nagafen's Lair. The Tower of Solusek Ro (aka Sol Ro Tower) "holds the entrance, and the true path to the Plane of Fire" and is in the plane of all the Gods surnamed Ro (Solusek, Jiva, Xuzl, etc.).
PoN usually designates the Plane of Nature (reached from the Wakening Lands on the continent of Velious), as the Plane of Nightmares is usually called "Nightmares". Usually.
EF could be "East Freeport" (also known as EFP), but probably means "EverFrost (Peaks)".
Kerra Isle, seldom visited, is off of Toxxulia Forest and is *not* the (somewhat more frequented) island full of Kerrans in "Erud's Crossing"... known as "Wisp Isle".
PoS generally means "Plane of Storms", not "Plane of Sky", which latter is actually the Plane of Air, or (as it shows up on /who), Airplane.
OT is "(the) Overthere", while OOT is "(the) Ocean of Tears".
TD is the Timorous Deep (which may be spelled with one more 'u' than I've given it) and the Deep is an underground zone on Luclin.
EC used to be unmistakeably "East Commonlands", where people often bought and sold before there was a Bazaar to go to. Now, it is more likely to mean "Echo Caverns", on Luclin, which has two separate sides both accessible from entrances in ShadowHaven. One side of Echo Caverns has trainers, merchants, and even a bank, with a few mosquitos and boglings, while the other is considerably more risky.
There are four (Plains of) Karana: East, West, North, and South. If a Druid ports you 'to the Karanas', you will arrive in East Karana; if a Wizard ports you there, you will either arrive in North Karana or West Karana.
Rathe is the name of the Rathe Mountains, but there's also a Lake Rathetear one zone over. If someone says "the Arena" without specifying a zone, they may mean the zone called "The Arena", which is off of Lake Rathetear.
New players might mistake references to "Guk" and "Gukta" for each other. The former is a pair of classic dungeons, Upper and Lower Guk (which is, formally, 'The Ruins of Old Guk'); the latter is the starting city for Frogloks, which used to be the Troll City known as "Grobb". Trolls now use the Foreigner's Quarter of Neriak (NeriakA) as their starting city, and have their own banker there (bonus points if you can stumble across him without using "find").
NeriakB and NeriakC are, respectively, known as the Commons (but that has also been used as a shorthand term for the East and West Commonlands) and Third Gate.
GF is "Greater Faydark", though in some contexts it could designate "Grimling Forest", on Luclin.
If you run across references to "Beholder's Maze", be aware that this means the Gorge of King Xorbb, and vice versa.
Likewise, "Howling Stones" is a term for Charasis.
LoIO is *not* an attempt at yodeling, but instead stands for "Lake of Ill Omen".
Edited, Thu Apr 22 20:04:52 2004 by LepidaTS