Buffs are positive effects on your character, shown as a green icon.
Debuffs are a negative effect on your character shown as a red icon.
A few icons relate to a changed state of your character which is neither positive or negative, these are shown as blue icons.
These icons are shown in the Buff Bar, opened in the classic client through a blue button on the expanded Status Bar, top left corner
In the enhanced client there are two bars which can be locked in place on the desktop.
In both clients these bars can be rotated by clicking on the corner blue button
State Icons
 Active Meditation |  Disguised |  Despair |  Gargoyle Flying |  Incognito |  Stealth |
Buff Icons
 Agility |  Ambusher's Essence |  Animal Form |  Anticipate Hit |  Arcane Empowerment |  Arch Protection |  Attune Weapon |  Bard Mastery Bonus |  Boarding |  Basstastic (fish pie) |
 Battle Lust |  Berry Buff |  Berserk |  Bless |  Block |  Blood Oath (caster) |  Conduit |  Confidence |  Consecrate |  Bodyguard |
 Broken Bone |  Burn Poultice |  Called Shot |  Combat Training |  Cora |  Counter Attack |  Cunning |  Curse Weapon |  Death Ray |  Defense Mastery |
 Divine Fury |  Draft of Might |  Enchant |  Enemy of One |  Ethereal Voyage |  Evasion |  Feint |  Focused Eye |  fof |  Gargoyle Berserk |
 Gift of Life |  Gift of Renewal |  Goblin |  Grapes of Wrath |  Heightened Senses |  Hemolyph Concentrate |  Hit Dual Wield in effect |  Hit Sparks |  Humility |  Immolating Weapon |
 Injection Strike |  Inspire |  Intuition |  Honorable Execution |  Honored |  Horrific Beast |  Invigorate |  Invisibility |  Lich Form |  Lightening Strike |
 Magic Reflection |  Magnus Effect |  Mana Phase |  Mana Shield |  Meteor |  Momentum Strike |  Mondo |  Mystic Weapon |  Night Sight |  Obelisk |
 Orange Petals |  Perfection |  Perseverance |  Poison immunity Resistance |  Poison Tolerance |  Polymorph |  Potency |  Prophylaxis Potion |  Protection |  Rage Focusing |
 Rampage |  Reactive Armor |  Reaper Form |  Resilience |  RoseOfTrinsic Petals |  Scavenge |  Searing Weapon |  Shadow |  Shield Bash |  Spell Passive |
 Spell Focusing |  Spirituality |  Stone Form |  Strength |  Surge |  swarm |  Thrust |  Toughness |  Town Trade Deal |  Trance Tonic |
 Tribulation |  Vampric Embrace |  Veterinary |  Virtue |  War Cry |  Warding |  Weapon Passive |  Whispering |  White Tiger |  Wraith Form |
 Wrestling Passive |
Debuff Icons
 Achieve Perfection |  Armor Pierce |  Armor Corrupt |  Aura of Nausea |  Bleed |  Blood Oath Curse |  Bloodworm Anemia |  Broken Bone |  Clumsy |  Corpse Skin |
 Criminal Status |  Criminal |  Curse |  Curse Weapon |  Death Ray |  Death Strike |  Despair |  Disarm |  Disarm |  Discord |
 Dismount | Discord | Dismount |  Dragon Slasher Fear |  Dragon Turtle |  Enemy of One |  Entangle |  Essence of Wind |  Ethereal Blast |  Evil Omen |
 Faction Stat Loss |  Fandancer Fan Fire |  Feeblemind |  Feint |  Force Arrow |  Gaze Despair |  Heat of Battle |  Hit Lower Attack |  Hit Lower Defense |  Hit Sparks |
 Honorable Execution |  Honored |  Howl of Cacophony |  Humility |  Injection Strike |  Magnus Effect |  Mind Rot |  Mortal Strike |  Onslaught |  Paralyze |
 Pierce |  Playing the Odds |  Poison |  Psychic Attack |  Rage |  Rage Focusing |  Rotworm Blood Disease |  Rune Beetle Corruption |  Skill Use Delay |  Sleep |
 Spell Plague |  Spell Focusing |  Splintering Effect |  Stagger |  Stamina |  Stat Loss |  Strangle |  Swarm |  Swing Speed |  Talon Strike |
 Thrust |  Tribulation |  Weaken |  Webbing |