Reviving an old General Semantics proposal: borrowing from scientific notation and using subscripts like 'Gwern2020' for denoting sources (like citation, timing, or medium) might be a useful trick for clearer writing, compared to omitting such information or using standard cumbersome circumlocutions.
Moved to gwern.net
I don't think they're confusingly different. See the "A single unified notation..." part. Distinguishing the two typographically is codex chauvinism.