Ok - here's a list of terms and abbreviations I use in my site - some FT ones and some FT associated terms.(Note - some of these I coined myself (marked with an *) - I'm happy for others to use them - but they're my terms and I hold the conceptual copyright to them) Some are pretty self explanatory, others I'll explain a bit more - either cause they're FT terms, or because they're my own. They're all in alphabetical order

Alma or Alm'harat - the goddess of the unicorns in the FT
Alma's back (or Mare's back) - term for the wide rolling great grass plains - so called because of the following:- "When Alma created the world, most of it she made into the great grass plains, which was not a flat place, but rolling like a mare's back and covered all over with thr greencorn and the haycorn and the wild oats, knee high, so that when the wind stirred it, billowing, it looked like a mare's winter coat blowing. And that is why some called the grasslands Alma's back." -  (Chpt 1 in BoFT)
Alma's eyes (Alm'harat's thousand, thousand eyes) - the stars in the night sky
BoFT - Birth of the Firebringer (1st book in the Firebringer Trilogy)
DM - Dark Moon (2nd book in the Firebringer Trilogy)
Daya or Da (single) - hornless equines in the FT, similar to our own world's horses.
FT or FBT -  The firebringer trilogy
IFAS* - International Firebringer Appreciation Society
In Net foal* (or net foaling*) - creating a online unicorn or equine character
Net-dam* - a female online RP player who has unicorn characters (or in fact, any equine or part-equine (e.g centaurs) character
Net foal* (m - net colt, f - net filly) a young character of a net sire or dam
Net foaled* - having created an unicorn or equine character
Net half-grown or full grown* - an older FT equine character of a net sire or dam, depending on age (age as in how long the character's been around, not statistical age)
Net Mare, Net Gelding or Net Stallion* - can be used either to apply gender to a net-full grown or half grown FT unicorn or simply to describe an FT daya, non FT unicorn or equine (Net Gelding would tend to be applicable only to non FT non unicorn-equine characters or FT daya).
Net-sire* - a male online RP player, who again has unicorn or equine characters
MAP - Meredith Ann Pierce - esteemed author of the Firebringer Trilogy
Moondancer, Ringdancer - one of the three main unicorn tribes described in the FT. They hold fairly strict laws and have a more rigid social structure (although this has varied over their history)
Plainsdweller, (Free People of the Plains) - another of the three main unicorn tribes described in the FT. They inhabit the plains, are nomadic and very liberal in nature and in their customs
Scouts of Halla (SoH) - the third major unicorn tribe in the FT before they re-merged with the Moondancers who they had been seperated from, so called because they are all descended from four scouts that the princess Halla sent out to find the red dragons. Because of inbreeding, they are all stocky, short and with similar colour - dappled or roan, with dark earthen colours.
ROPL* - Rolls or Rolling on the plains laughing
ROPLMHO* Rolling on the plains laughing my head off
True name - secret name of a unicorn - usually know only to himself or herself, his dam and possibly his mate if they have pledged (or perhaps in some circumstances to very close companions)
TSoSS or SoSS - The Son of Summer Stars (3rd book in the Firebringer Trilogy)
Two-foot - term for a human in the FT.
Valedweller, Southlander - term for the Moondancers/Ringdancers before they won back their ancestoral homeland
Use name - common name of an FT unicorn, know widely to his family and friends