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The unwritten rule of tabletop Role Playing Games (but can be applied elsewhere). It says:

"Don't be a dick."

It essentially means players should treat each friendly and with respect.

If someone intentionally does something inappropriate, or acts maliciously towards another player or players, he's breaking Rule 0.

Particular behavior breaking the rule may differ according to a game you are playing. For example, some RPGs are designed as competitive games, while others are cooperative. Behaviour common in the first type could be sometimes considered bad (breaking the Rule 0) in the latter.
In most games, killing another player's character without proper reason* qualifies as breaking Rule 0.

* other than "I wanted your loot / I wanted to earn XP by killing you / I did it for the lulz" etc...
Rule 0 by skewCZ April 17, 2011
Related Words
Rule 34 Rule Rule 35 rule 1 RULE #1 rule 2 ruler Rule 11 rule 43 rule 69

rule 157 

No one is allowed to fuck UNLESS they have the N-word pass, AND the chick is hot on a scale of 1 to 10.
Boy 1: Did you fuck her?
Boy 2: Nah. Rule 157 applies.
Boy 1: You dont have the N-word pass?
rule 157 by Sonicwave.exe July 27, 2021
Sex Offender, usually a child molester.

Ther term comes from the British prison system practice of segregating Sex Offenders under Rule 45, to stop them being attacked by other inmates. (Formerly Rule 43)
"If I could get onto that Wing with a razor blade, I'd have a ball. Or possibly a handful of balls, I hate Nonces "
"Yes, but Governor, you are obliged to protect those Rule 45 boys"
Rule 45 by Toxteth O' Grady August 21, 2012
Dude why are you crying about yo small ass dick , Rule 32 bruh, enjoy the little things.
Rule 32 by Macsizer February 8, 2018
When no other rule can be applied to a situation, Rule 65 applies.
Hank: "oh man, there's nothing to do...we've been sitting here forever..."

Bob: Rule 65
Rule 65 by LordTaliesin November 10, 2010

Rule of 2 

Most commonly used in quiz or exam multiple choice situations.

After trying to figure out a numerical problem and getting the wrong answer BUT you are in the ballpark area, divide or multiple by 2 to get your answer.

If you have no idea how to get the right answer the right way, it is in your interest to use the rule of 2 .

This rule also works with 10, but that is more commonly used for conversion errors (metric).
I couldn't get 1250 for the life of me! I kept getting 1250.

Me too, I just used the rule of 2 though.
Rule of 2 by da Yooper 93 July 14, 2011