“multiple storage”
Within the history of personal knowledge management, one was often faced with where to store their notes so that it would be easy to find and use them again. Often this was done using slip methods by means of "multiple storage" by making multiple copies and filing them under various headings. This copying process was onerous and breaks the modern database principle "don't repeat yourself" (DRY).
Alternate means of doing this include storing it in one place and then linking that location to multiple subject headings in an index, though this may cause issues of remembering which subject heading when there are many appropriate potential synonyms.
Modern digital methods allow one to store a note in one location and refer to it in multiple ways electronically as well as with aliases.