grey code 

A digital numbering system in which only one bit is changed at a time. This results in less errors.

0 = 0000
1 = 0001
2 = 0011
3 = 0010
4 = 0110
5 = 0111
6 = 0101
You get the idea.

grey code by D1 March 27, 2005

Code Grey 

Code Grey means when ever you have a plan to take action on a target that deserves punishment.

Hey, Johnny I saw him come round the block. Code Grey.

Code Grey by YaBoiCon February 7, 2020