The number may appear in research data tables or as a specific value in genomic mapping.

: Many historical documents, such as the American Railroad Journal , are archived with various numerical IDs.

In the context of healthcare and billing, is a specific CPT code used for a surgical procedure. "RAR" often appears in these contexts as an acronym for Revenue Agent's Report or Running Account Receipt .

In biology and oncology research, refers to Retinoic Acid Receptors (e.g., RARα, RARβ, RARγ).