0000

Midnight, aka "four balls". In military time, this is the first minute of the day.

"What time is it?"
"0000."

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0000

The password for the most retarded persons phone.

Man 1 whats your password
Man 2 0000
Man 1*breathes in* BOI

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U+0000

The Unicode null character, , which often terminates a null-terminated string. Its mere presence in a string (outside the end) will always cause software bugs. I tried to include the character itself (faulty PDF OCR from an underlined “가”, confirmed through a Unicode converter), but it would always cause UD to error (obviously).

I used empty brackets because I tried to insert the actual character, but Urban Dictionary would always

This character U+0000 is impossible to get into a string, and if inserted into a URL by %00, can unlock a security vulnerability called null byte injection

000-000-0000

A number that appears on telephones mysteriously at night when no one is around.

Usually it's a government spy trying to get a hold of you.

"Hey, that's wierd... I just got callled by a number 000-000-0000!"

"Don't answer, it's a government spy!"

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