L5= Gate Guard RP
I3= Activist
B4= Load Screen Veteran
I2=NPC

A1: Damage
A2: Healer
A3: Tank
A4: Materials
A5: Champion Point
A6: Delve
B1: Dragonknight
B2: Elder Dragon
B3: Earthen Heart
B4: Ardent Flame
B5: Nightblade
B6: Assassination
C1: Shadow
C2: Siphoning
C3: Necromancer
C4: Grave Lord
C5: Bone Tyrant
C6: Living Death
D1: Sorcerer
D2: Dark Magic
D3: Storm Calling
D4: Daedric Summoning
D5: Templar
D6: Dawn's Wrath
E1: Aedric Spear
E2: Restoring Light
E3: Warden
E4: Animal Companions
E5: Green Balance
E6: Winter's Embrace
F1: Skyshard
F2: Dark Anchor
F3: Solo Arena
F4: Veteran
F5: Imperial City
F6: Player versus player (it's a warhorn but Assault and Support skill lines don't have distinct icons--it's next to other PvP icons so it probably means "PvP in general" rather than; could possibly be dueling?)
G1: Siege (possibly intended as Cyrodiil PvP rather than sieging specifically)
G2: Battlegrounds
G3: Fighters Guild
G4: Mages Guild
G5: Justice
G6: Psijic Order
H1: Undaunted
H2: Vampire
H3: Werewolf
H4: Dark Brotherhood
H5: World skill line icon
H6: ?
I1: Companion? Group?
I2: Quest
I3: Clenched fist (this icon is used in-game somewhere but I can't remember where)
I4: Battle axe (Two Handed?)
I5: Crossed scimitars (Dual Wield?)
I6: Cracked sword (One Hand and Shield?)
J1: Armor
J2: Bow
J3: Marksman's target
J4: Destruction Staff
J5: Lightning bolt
J6: Wizard's hat
K1: Hourglass
K2: Tankard
K3: Sweetroll
K4: Dice
K5: Group Leader
K6: Runestone
L1: A tooth
L2: Cliff racer
L3: Mudcrab
L4: Daedric Titan skull (?)
L5: Arrow in the knee
L6: Shout
M1: A muscular torso; possibly a pice or armor?
M2: Skooma bubbler


A lot of these are guesses but that should be the gist of it.