Abkürzungen

ACK = Acknowledgement
AFAIK = As Far As I Know
AFAIR = As Far As I Remember
AKA = Also Known As
BOFH = Bastard Operator From Hell (see also)
BTW = By The Way
CS = Closed Source (Software)
CSS = Closed Source Software/Cascading Style Sheets
DFTT = Dont't Feed The Troll  
F2F = Face To Face
FUBAR = Fucked|Fouled Up Beyond All Recognition|Repair
FYI = For Your Information
HAND = Have A Nice Day
HTH = Hope That|This Helps
IIRC = If I Remember Correctly
IOW = In Other Words
LOL = Laugh(ing) Out Loud
MTTB = Mean Time To Bildschirmreinigung
MTU = Maximum Transmission Unit
NACK = Negative Acknowledgement
OS = Operating System
OSS = Open Source Software
PEBKAC = Problem Exists Between Keyboard And Chair
PLONK = Please Leave Our Newsgroup Kid
PM = Persönliche Mail
RIP = Rest In Peace
ROTFL = Rolling On The Floor, Laughing
SCNR = Sorry, Could Not Resist
SIMA = Shit, It's Monday Again
STFU = Shut The Fuck Up
TGIF = Thank God It's Friday (or for blondes: Toes Go In First, found on their shoes)
THX = Thanks oder THX
TIA = Thanks In Advance
TLA = Three Letter Acronym
TYVM = Thank You Very Much
tl;dr = too long; didn't read
WINP = Wilde is not Panda
WTH = What The Hell
WTF = What The Fuck
YABA = Yet Another Bloody Acronym
XTLA = eXtended TLA
(-> Akronyme)

wichtige Hinweise in Antworten:

FAQ = Frequently Asked Questions
STFF = Search This Freaking Forum ?
STFW = Search The Freaking Web .
RTFM = Read The FAQ 'n Manual
RTFM = Read The Fucking Manual (andere, weiter verbreitete Variante)
RTFM = Read The Fine Manual (die höfliche Variante ;)

bitte hier die Abstufungen beachten:

IMO = In My Opinion
IMHO = In My Humble Opinion
IMNSHO = In My Not So Humble Opinion
IMVHO = In My Very Humble Opinion
IMAO = In My Arrogant Opinion

siehe auch:
AOL, C&P aka C+P (-> C&P-Liste), DAU, DFTT, FAQ, ^H, KT, NT, ONU, OP, OS, OSS, OT, PISA, PLONK, RIP, RL, RTFM, Tefinch, TOFU, U2U

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Logische Operatoren:

!= nicht/ungleich
== (ist) gleich
|| oder
&& und
// aber ;-)

andere Notationen:

-> siehe unter; Verweis auf:
^H, ^W
/. = slashdot
s/xxx/yyy = suche 1. Vorkommen von xxx und ersetze mit yyy
s/xxx/yyy/g = suche xxx und ersetze mit yyy 
s/xxx//g = lösche alle Zeichenketten xxx

Zahlen:

23
42
666
883 - ein von vielen in den Foren als Troll angesehener Ex-Heise-User 

keine Abkürzungen oder Akronyme:

UND = und
ODER = oder
ROLF = Rolf oder Tippfehler von ROFL
ERNSTL -> Buchstaben kaufen

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Weblinks

• Acronymfinder zum Mitnehmen
• Acronym Server (en)
• Deutsche Abkürzungen
• LEO: De-En-Wörterbuch und LEO: De-Fr-Wörterbuch
• Google Suche mit dem Schlüsselwort define:. -> Google Spickzettel (en)
• Heise Volltextsuche mit Hilfe

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Special RTFM:
RTFM = Read the Field/ Fine/ Flaming/ Flipping/ Forgotten/ Freaking/ Fscking/ Furnished/ Friendly/ Fantastic/ Famous Manual/ Material

Special SCNR:
LINUX = Lost In Nothing Under XFree (-> Flame, OS-Vergleiche)

Macintosh = Most Applications Crash; If Not, The Operating System Hangs (gefunden auf Heise-Link)