Help:SpellInformation

Icons

The 2 icons in the upper right-hand corner of the Spell Information block are the Spell Icon and the HO Wheel Icon .

Category is in 2 parts. Spell Type, and (Target)

Can be any ONE of the following values (see Spell Types for a complete list):

DD - Direct Damage
DOT - Damage Over Time
Heal - Heals target
HOT - Heal Over Time
Buff - Improves the targets performance or survivability
Debuff - Decreases the targets performance or survivability
Reactive Heal - Heals the target in reaction to damage
DS - Damage Shield. When target is attacked a DS does damage to the attacker.
Ward - Protects the target from some damage of some type for some time.
Illusion - Changes the shape, usually, of the caster, but has no real in-game effect
Taunt - modifies the hate list of the target
Res - Resurrection, Revive, etc.

Can be any ONE of the following values:

Self - Spell targets, or is centered on, the caster
Pet - Spell targets, or is centered on, the caster's pet
Friend - Spell targets, or is centered on, any player character
Group Friend - Spell targets, or is centered on, any player character who is grouped with the caster
Raid or Group Friend - Spell targets, or is centered on, any player character who is in the same raid as the caster
Enemy - Spell targets, or is centered on, any single enemy
AE (a.k.a. Self (AE))- Area Effect. Spell affects ALL enemies within the Radius of Effect from the caster.
Group (a.k.a. Group (AE)) - Spell is centered on the caster and affects all group members so long as they remain within the Radius of Effect of the caster.
Enemy AE - Area Effect. Spell affects ALL enemies within the Radius of Effect from the target, regardless of whether they are grouped with the target.
Encounter - Spell affects the target and all enemies grouped with the target, within the Radius of Effect

Also see Max Targets

... more to come