Related to literature notes, but a small level down are the sorts of basic highlights that one makes in their books/reading. For pedagogy's sake they're a sort of fleeting note that might be better rewritten in a progressive summarization form. Too often they're not, but sit there on the page in a limbo between the lowest form of fleeting note and a literature note.

Hierarchy of annotations and notes: - fleeting notes - highlights - marginalia marks: ?, !, ⁕, †, ‡, ⁂, ⊙, doodles, phatic marks, tags, categories, topic headings, etc., - very brief annotations - literature notes (progressive summaries) - permanent notes