- Paper
- (Media Codec)
- Symbols
- (Rate Codec)
- Envelope
- (Ring Codec) 3, 2 …
- Post Office
- (Drone codec)
- Letter Box
- (Pizza codec)
- Name
- (Index codec)
- Dear
Considering the ISO network model of 7 layers can be looked at as an isomorphism to a letter delivery with Paper being the lowest hardware layer and Dear being the application layer, there is a set of 6 codecs which transform layer to layer and so a more exacting 13 layer model is just as obvious given the requisite definitions.
There also would exist a Loop CodecĀ which would virtualize via an application a container of a virtual hardware layer on which another stack of 13 could be founded.