The M message encoding scale was a Culture communications standard. Each level on the scale represented a protocol, or set of protocols, used to encode and encrypt messages. Levels on the scale were denoted by a floating point number (eg. M16.4); an exception was Mclear.
|Mclear||Standard nonary Marain|
|M1||Basic Culture Intergalactic Ship Language|
|M2||Standard Contact Idiom|
|M16||Special Circumstances Section High Level Code Sequence|
|M32||Special Circumstances absolute-need-to-know Level Maximum Encryption Code Process (SCantk)|