@thinkaboutthebible has done work on the classification and nomenclature of memory systems:
Myself, I believe that many systems can be combined: Method of loci be combined with song/music, a grid like ordering system, pegwords etc.
- What would you name a mnemonic where multiple visually encoded information is associated with a central image? (for example, see here - ignore the audio, just focusing on the picture). Initially, at face value, this is a chain-type link method, but the information is not chained sequentially where 1 linked to 2, linked to 3, linked to 4…, instead, it would be 1 linked to 2, 1 linked to 3, 1 linked to 4 etc, where all the information is linked to a single main image.
This is really a version of the method-of-loci - the locus (background) here is the primary image. To me, there isn’t much distinction between a background and image - a background can represent information as well.
Another thing not touched upon in the chart is how individual images can be constructed - two separate images can be linked together, but also you could just use PAO (Person-Action-Object) or SEA-IT (Subject-Enhancement-Action-Item-Terrain) to create an image that represents up to 5 things.