If you are referring to a specific software tag, a musical note, or a different technical "Note: rare91," please provide more (e.g., coding, music, or finance) so I can give you the exact feature you're looking for.

The "rare91" designation is most commonly associated with a specific documentation feature:

: Collectors use these notes to distinguish "standard" rare cars from those with high-value factory deviations (such as specific interior stitching or deleted sunroofs).

Rare91 — Note:

The "rare91" designation is most commonly associated with a specific documentation feature: Note: rare91

: Collectors use these notes to distinguish "standard" rare cars from those with high-value factory deviations (such as specific interior stitching or deleted sunroofs). If you are referring to a specific software