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A language in which numbers and symbols are put together to look like letters. Some people create their own 1337 letters and it makes them look more 1337 by fellow 1337-speakers. Here is an alphabet of 1337 letters I know and have created:

A: 4 or l\ or ^ or @ or /\ or /-\
B. l3 or 8 or ß or ]3 or l:
C: ( or < or © or ¢
D: l) or l> or ])
E:3 or £
F: l= or # or ƒ
G:6 or 9
H: # or l-l or (-) or !-! or }-{ or }{ or l+l or )+( or !+! or }+{
L: 1 or ! or ] J: _l or _/ K: [l< or l( or l{ or l<=
L: l_ or ! or 1
M: l\/l or /\/\ or l\l\ or ^^
N: l/l or /\/
O: 0 or () or <> or * or ø or Ó or °
P: l* or l> or |D or l^ or l+
Q:& or (\) or ¶
R: l2 or ®
S: 5 or $ or §
T:+ or 7
U: l_l or /_/
V: \/
W:|/\| or \/\/ or |/\/ or \/\|
X: >< or }{ or :-:
Y: ¥
Z: 2
()/\/\9 7^l+l+ 15 73)-( 1337 #l\:-:<>l2 1 +()l_l> _/<>* ^l3°l_l+ /\/\3}-{ #1213l/ll>!!!1!!11!1!! )+(3 |D\l\/l/l2.

translation:Oh my god that is the leet hacker I told you about my friend! He owns.
1337 by finity July 9, 2004
Related Words
1337. Originally used by hackers to avoid simple net searches that would turn up, for example, "I am an elite hacker".

Instead hackers would say "1 4|\/| 4|\| 31337 |-|4x0|2".

"31337" was later shortened to "1337".

Now 1337 used mainly by the gaming community (also in chatrooms) to mean an especially skilled player.
1. 7|-|3 |=|31 15 93771|\|9 (|053 70 7|-|15 31337 0p3|24710|\|!

2. im s0 1337 taht i pwn ur @ss n00b!
1337 by Grakkar April 22, 2004
n. 1. Nestled between 1336 and 1338, 1337 is commonly known as a number, or for the more advanced; an "integer"
2. Often misused to satisfy a lamen's ego, the self-proclaimed 1337 will misuse the title, pretending to hold Xtr3m H4x0r capabilties while in fact masturbating to preteen beastiality at 2:00 AM with baggy eyes; anonymously hassling n00b's with better things to do than kill their babies over mindrot such as Everquest and Warcraft. See also "colon debris" and "queefstain"
"i t0tally pnwed u. u r so a n00b and i am so 1337"
1337 by PoonPieHouligan August 17, 2003
1337 is the language of hackers and newbies across the internet. Also, the words in 1337 are usually short(ie "are" becomes "r") and intentionally spelt wrong(ie "the" becomes "teh", this is most common with e switching places and o's becoming p's)

the mostly complete translation chart(exluding unicode characters, ie ©):
A=4 /-\ @ ^ /\
B=8 ]3 ]8 |3 |8
C=( {
D=) [} |) |} |> > E=3 F*=# |= G=6 9 (_> H=# |-| (-) )-( }{ {-} /-/ \-\ I=1 ! [ | J**=_| j K=|< |{ [L=1 |_
M=/\/\ |\/| \/
N=/\/ |\| \
O=0 ()
P=|D |* |>
Q=0,
R=|2 |? |-
S=5
T=7 + ']' U=(_) |_| \_\ /_/ V=\/ W=\/\/ |/\| /\ X**=>< }{ X Y='/ % Z**=2 z Common mispellings: the = [teh
that = taht
take = taek
own = pwn
you = joo
dude = jood

common phonetic replacements(always used in true 1337):
f = ph
ck == xx

*there is no 'F' in true 1337, it is replaced by the 'ph' phonetic in true 1337

**acceptable when not replaced by a symbol
_|00 |2 4/\/ |_||\|1337 (_)83|2 |-|4><><0|2

Translation: You are an unleet uber hacker
1337 by Amnesiasoft October 26, 2004
Once used by the hacker community as sort of a sub-culture language, ANYONE using this type of speak in the present day in age is either:

A) A clueless net newbie who somehow thinks its still "cool" to speak this way.

B) A veteren net user who uses it to parody the type of people mentioned in example A.
u r n0t 1337 d00d!!11
1337 by Lord Requiem November 14, 2002
1337 was the year the hundred years war started making an obscure factoid a totally useless piece of gamer common knowledge.
Professor: "What year did the hundred year war start? Anyone? Anyone?"

You: "Ohhh! Ohhh! 1337!"

Professor: "Ok theres the gamer"
1337 by otacon July 23, 2006
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Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
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Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
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