(This list does not include weapons or perks or other technical terms)
[u][b]NF[/b][/u] - [i]Nighfall[/i], originally an alteration of your run of the mill strike, it was stacked with modifiers including one that put you back into orbit upon a Fireteam wipe, all in the hope to receive some of the best rewards in the game, including an xp boost. Since year 2, it's just been a glorified heroic strike with mediocre rewards and isn't considered worth anyone's time.
[u][b]VoG[/b][/u] - [i]Vault of Glass[/i], raid featured in Vanilla Destiny
[b][u]IB[/u][/b] - [i]Iron Banner[/i], PVP event. Originally exclusive to Control. Now encompasses Clash and occasionally Rift.
[b][u]TDB[/u][/b] - [i]The Dark Below[/i], Destiny's first expansion. Dark times indeed.
[b][u]CE[/u][/b] - [i]Crota's End[/i], TDB's raid, notorious for being able to be soloed.
[b][u]HoW[/u][/b] - [i]House of Wolves[/i], Destiny's 2nd expansion. Introduced gear ascension.
[b][u]PoE[/u][/b] - [i]Prison of Elders[/i], Destiny's first Arena, introduced in HoW, it became tedious very quickly. Dismantle mines, yeesss?
[b][u]ToO[/u][/b] - [i]Trials of Osiris[/i], long awaited PVP event that came along in HoW along with the introduction of Elimination. Do you have what it takes to get to the Lighthouse?
[b][u]MoT[/u][/b] - [i]Moments of Triumph[/i], yearly activity held to see if you as a player managed to "git gud" and stay good.
[b][u]TTK[/u][/b] - [i]The Taken King[/i], Destiny's first DLC that seemed like a DLC.
[b][u]CoO[/u][/b] - [i]Court of Oryx[/i], a PVE activity that serves as a spiritual successor to PoE. Engrams galore.
[b][u]KF[/u][/b] - [i]King's Fall[/i], TTK's raid. Infamous for being long, tedious, and giving you everything but what you needed to hit max light. Gotta have those moldering shards.
[b][u]FotL[/u][/b] - [i]Festival of the Lost[/i], Halloween event created solely to take our money. Unless you like collecting candy. What are you, 14? Wait...
[b][u]SRL[/u][/b] - [i]Sparrow Racing League[/i], also created to take our money, this event was actually fun, they removed it for seemingly no reason. Some argue racing doesn't belong in a shooter. But apparently dancing does.
[b][u]CD[/u][/b] - [i]Crimson Doubles[/i], Bungie's third attempt to satisfy our hunger in the content drop. This Valentines Day event was actually created by High Moon Studios and not Bungie.
[b][u]CotE[/u][/b] - [i]Challenge of the Elders[/i], a large portion of the community decided to ignore the "the" and shorten it to the easier [u][b]CoE[/b][/u], CotE/CoE serves as an upgraded and revamped PoE added during the April update.
[b][u]RoI[/u][/b] - [i]Rise of Iron[/i], Destiny's much awaited 2nd full-scale DLC. The fact that I and lower case L's look alike make this acronym feel awkward.
[b][u]AF[/u][/b] - [i]Archon's Forge[/i], Destiny 2nd Arena, being introduced in RoI, much is unknown about it, but it's lit.
[b][u]WotM[/u][/b] - [i]Wrath of the Machine[/i], RoI's Raid, like most RoI content, not much is known about it other than the fact the raid gear looks a bit strange.
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Ktm- "Kill them back!", one of Variks's famous quotes from PoE. Unfortunately that ended during the first confrontation with Malok, Variks wanted him to face Judgement in Prison for reasons unknown. Probably because he didn't dismantle mines. The ghost however took up the opportunity to make an unexpected but funny Variks impression.