As Chris discovered with
, these aren't always 100% consistent, but here's what I consider/understand to be the "canonical" list of icon codes (because it is used to generate the card1e pages):
"[Baj]" => "1E-BAJ.gif"
"[Bor]" => "1E-BORG.gif"
"[Borg]" => "1E-BORG.gif"
"[Car]" => "1E-CARD.gif"
"[Dom]" => "1E-DOM.gif"
"[Fed]" => "1E-FED.gif"
"[Fer]" => "1E-FER.gif"
"[Kli]" => "1E-KLG.gif"
"[NA]" => "1E-NON.gif"
"[Rom]" => "1E-ROM.gif"
"[SF]" => "1E-STF.gif"
"[Sta]" => "1E-STF.gif"
"[Neu]" => "1E-NEU.gif"
"[Non]" => "1E-NON.gif"
"[Kaz]" => "1E-KAZ.gif"
"[Vid]" => "1E-VID.gif"
"[Hir]" => "1E-HIR.gif"
"[Vul]" => "1E-VUL.jpg"
"<Baj>" => "InfiltratorBajoran.jpg"
"<Bor>" => "InfiltratorBorg.jpg"
"<Car>" => "InfiltratorCardassian.jpg"
"<Dom>" => "InfiltratorDominion.jpg"
"<Fed>" => "InfiltratorFederation.jpg"
"<Fer>" => "InfiltratorFerengi.jpg"
"<Hir>" => "InfiltratorHirogen.jpg"
"<Kaz>" => "InfiltratorKazon.jpg"
"<Kli>" => "InfiltratorKlingon.jpg"
"<Non>" => "InfiltratorNonAligned.jpg"
"<Rom>" => "InfiltratorRomulan.jpg"
"<Sta>" => "InfiltratorStarfleet.jpg"
"<Vid>" => "InfiltratorVidiian.jpg"
"<Maq>" => "InfiltratorMaquis.jpg"
"<Vul>" => "InfiltratorVulcan.jpg"
"[BAJ]" => "MissionBajor.jpg"
"[BOR]" => "MissionBorg.jpg"
"[BORG]" => "MissionBorg.jpg"
"[CAR]" => "MissionCardassian.jpg"
"[DOM]" => "MissionDominion.jpg"
"[FED]" => "MissionFederation.jpg"
"[FER]" => "MissionFerengi.jpg"
"[KLI]" => "MissionKlingon.jpg"
"[ROM]" => "MissionRomulan.jpg"
"[STA]" => "MissionStarfleet.jpg"
"[NON]" => "MissionNonAligned.jpg"
"[KAZ]" => "MissionKazon.jpg"
"[VID]" => "MissionVidiian.jpg"
"[HIR]" => "MissionHirogen.jpg"
"[VUL]" => "MissionVulcan.jpg"
"[TOS]" => "MissionTOS.jpg"
"[DQ]" => "DeltaQuadrant.jpg"
"[GQ]" => "GammaQuadrant.jpg"
"[MQ]" => "MirrorQuadrant.jpg"
"[MU]" => "MirrorQuadrant.jpg"
"[AU]" => "Alternate-Universe.jpg"
"[Holo]" => "Hologram.jpg"
"[Bar]" => "Barash.jpg"
"[OCD]" => "OCD.jpg"
"[Orb]" => "Orb.jpg"
"[KCA]" => "Alliance.jpg"
"[TE]" => "Empire.jpg"
"[Nav]" => "SubCommandNavigation.jpg"
"[Com]" => "SubCommandCommunications.jpg"
"[Def]" => "SubCommandDefense.jpg"
"[KW]" => "KetracelWhite.jpg"
"[Maq]" => "Maquis.jpg"
"[Cmd]" => "CommandIcon.jpg"
"(Cmd)" => "CommandIcon.jpg"
"[Stf]" => "StaffIcon.jpg"
"(Stf)" => "StaffIcon.jpg"
"[OS]" => "OriginalSeries.jpg"
"/Ent-E" => "EnterpriseE.jpg"
"[Ent-E]" => "EnterpriseE.jpg"
"[Films]" => "ClassicFilms.jpg"
"[CF]" => "ClassicFilms.jpg"
"[22]" => "22nd.jpg"
"<Y)" => "Nemesis_Yellow_Left.jpg"
"(Y>" => "Nemesis_Yellow_Right.jpg"
"<L)" => "Nemesis_Blue_Left.jpg"
"(L>" => "Nemesis_Blue_Right.jpg"
"<R)" => "Nemesis_Red_Left.jpg"
"(R>" => "Nemesis_Red_Right.jpg"
"<S)" => "Nemesis_Silver_Left.jpg"
"(S>" => "Nemesis_Silver_Right.jpg"
"<K)" => "Nemesis_Black_Left.jpg"
"(K>" => "Nemesis_Black_Right.jpg"
"<G)" => "Nemesis_Green_Left.jpg"
"(G>" => "Nemesis_Green_Right.jpg"
"<P)" => "Nemesis_Purple_Left.jpg"
"(P>" => "Nemesis_Purple_Right.jpg"
"[WC]" => "WarpCore.jpg"
"[RC]" => "ReactorCore.jpg"
"[TNG]" => "1E-TNG.gif"
"[DS9]" => "1E-DS9.jpg"
"[Self]" => "Self.jpg"
"[BB]" => "1E-BB.jpg"
"[HA]" => "HiddenAgenda.jpg"
"[Rule]" => "Rule.jpg"
"[Ref]" => "Referee.jpg"
"[BO]" => "BorgOnly.jpg"
"[Pun]" => "Punishment.jpg"
"[Crime]" => "Crime.jpg"
"[Pursuit]" => "Pursuit.jpg"
"[1]" => "Countdown1.jpg"
"[2]" => "Countdown2.jpg"
"[3]" => "Countdown3.jpg"
"[4]" => "Countdown4.jpg"
"[5]" => "Countdown5.jpg"
"[X]" => "CountdownX.jpg"
"[Flip]" => "TacticDraw.jpg"
"[Down]" => "TacticCurrent.jpg"
"[Fajo]" => "icon_fajo_collection.jpg"
"[eDS9]" => "icon_deep_space_nine.jpg"
"[eHA]" => "icon_holodeck_adventures.jpg"
"[Preview]" => "icon_preview.jpg"
"[FC]" => "icon_first_contact.jpg"
"[Sch]" => "Scheme.jpg"
"[2eDS9]" => "ds9.gif"
"[E]" => "earth.gif"
"[TN]" => "teroknor.gif"
"[2eTNG]" => "tng.gif"
"[Voy]" => "voyager.gif"
"[P]" => "Planet.jpg"
"[S]" => "Space.jpg"
"[S/P]" => "Space_Planet.jpg"
"[Artifact]" => "Artifact.jpg"
"[Equipment]" => "Equipment.jpg"
"[Event]" => "Event.jpg"
"[Interrupt]" => "Interrupt.jpg"
"[Interrupt/Event]" => "InterruptEvent.jpg"
"[Doorway]" => "Doorway.jpg"
"[Q]" => "QIcon.jpg"
"[Incident]" => "Incident.jpg"
"[Objective]" => "Objective.jpg"
"[Tribble]" => "Tribble.jpg"
"[Trouble]" => "Trouble.jpg"
"[Tactic]" => "Tactic.jpg"
"[Damage Marker]" => "Tactic.jpg"
"❖" => "Universal.jpg"