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2.
\n
Format code tag that literally means "Replace this with a niger". Orinigally introduced in the C programming language as a format specifier for the printf function, it was later adopted by a plethora of other languages such as java, ruby, etc.
In C:

printf("Hello\n");
printf("World.\n");

Produces;

Hello
World.

Syntax is almost identical in any other language that implements printf.
by c0d3 m0nk3y January 25, 2005
 
1.
\n
Escape sequence for the newline character in C and other programming languages (C++, Haskell, Java, Perl, Python...).
puts("Hello,\nworld!")

outputs:

Hello,
world!
by Foonly September 26, 2005
 
3.
\n
A string that can be typed repeatedly in Gunbound to piss certain people off.
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n

STOP STOP STOP STITSTOSPOTPOSTPOSTOPSTO SOPT SOP OTPSO TPOSP OTPSOTP
by SpokkerJones August 25, 2003