There is a kind of “second cousin” kinship between category markers and grammatical aspects, moods, or tenses. In several drafts of an earlier comment I experimented with grammatical terms like conjugation, declension, diacritic, inflection, etc. to explain the function of category markers. But I eventually decided this laid too much stress on their grammatical aspect and distracted from their main function, which is to focus the relation between formal expressions and formal objects.
- Logic Syllabus • Relational Concepts
- Precursors of Category Theory
- Survey • Precursors Of Category Theory