Originally from psych (Pinkert discusses them) as a way of organizing items in such a way that the multiples form one chunk. The chunk is the one idea per page that can be consequently employed in a larger array. More

The chunk is the modular note.

And staying with the chunk, The Gloss is a handle on that chunk - the item we need to store in memory so to access the more extensive content of the chunk. The Gloss was the WikiWord, and it still can be.