rbar

RBAR can refer to multiple terms across different domains, and there is no single universally accepted definition. To ensure I provide a useful article, could you specify whether you want a general disambiguation-style entry that outlines the main uses in several fields, or a focused article on a particular meaning (for example, a technical term in computing, a biological term, or a brand/organization that uses RBAR)? If you prefer a general piece, I can draft a concise, neutral overview of the most commonly cited uses in technology, science, and organizations within 200–300 words.