Mana Symbols
[sW] = White Mana
[sU] = Blue Mana
[sR] = Red Mana
[sB] = Black Mana
[sG] = Green Mana
Phyrexian Mana Symbols
[s;p] = White Mana
[s;q] = Blue Mana
[s;s] = Red Mana
[s;r] = Black Mana
[s;t] = Green Mana
[s;u] = Mana Symbol
Hybrid
Mana Symbols
[s;b] = {w/b}
[s;h] = {r/w}
[s;d] = {u/r}
[s;c] = {u/b}
[s;f] = {b/g}
[s;i] = {g/w}
[s;j] = {g/u}
[s;g] = {r/g}
[s;a] = {w/b}
[s;e] = {b/r}
[sp] = Snow Mana
[s;k] = {2/w}
[s;l] = {2/u}
[s;m] = {2/b}
[s;n] = {2/r}
[s;o] = {2/g}
Bubble Numbers
[s0] – [s9] = {0} – {9}
[sa] = {10}
[sb] = {11}
[sc] = {12}
[sd] = {13}
[se] = {14}
[sf] = {15}
[sg] = {16}
[sh] = {17}
[si] = {18}
[sj] = {19}
[sk] = {20}
Expansion Symbols
[sSET XXX Y] = XXX is the expansion code and Y is the
rarity. For example [sSET GTC R] will produce a Gatecrash rare expansion symbol.
Card Type Symbols
[sSpellL] = Land symbol
[sSpellA] = Artifact symbol
[sSpellC] = Creature symbol
[sSpellS] = Sorcery symbol
[sSpellI] = Instant symbol
[sSpellE] = Enchantment symbol
Other Symbols
[sLizard] = Lizard Logo
[sHat] = Wizards Hat
[sBooster] = Booster Pack
[sAdept] = ORC eye
[sPig] = Pig
[sClan] = Clan
[sS] = Smiley Face
[sF] = Frowny Face
[sY] = Yucky Face
[sMute] = Muted
[sE] = Trophy
[sWiz] = WotC logo
[sZ] = Away Icon ‘zzzz’
[sT] = Tap
[sQ] = Untap
[sPB B] = Black Paintbrush
[sPB W] = White Paintbrush
[sCLONE] = Clone
[sDECK] = Deck
[sFOLDER] = Folder
[sGY] = Tombstone
[sLifeHeart] = Heart
[sSwoosh] = Shooting Star
Up/Down Arrows
[sV] = Red Down Arrow (Small)
[sArrCardsD] = Green Down Arrow
[sArrGameplayD] = Red Down Arrow
[sArrSettingsD] = Light Blue Down Arrow
[sArrAdminD] = Grey Down Arrow
[sArrCommunityD] = Purple Down Arrow
[sArrHelpD] = Yellow Down Arrow
[sArrCardsU] = Green Up Arrow
[sArrGameplayU] = Red Up Arrow
[sArrSettingsU] = Light Blue Down Arrow
[sArrAdminU] = Grey Up Arrow
[sArrCommunityU] = Purple Up Arrow
[sArrHelpU] = Yellow Up Arrow
[sListBoxArrowU] = Shiny Up Arrow
[sListBoxArrowD] = Shiny Down Arrow
Most of the information came from the following websites. I corrected a great deal of mistakes that were made as well as contributed a considerable amount of icons and symbols that were not listed on either website. If I missed anything let me know in the comments and I'll add them to the list!
Sources
http://www.wizards.com/Magic/Digital/MagicOnline.aspx?x=mtg/digital/magiconline/howdoi/talk
http://wizards.custhelp.com/app/answers/detail/a_id/460
