The identifier is most prominently associated with a 2023 scientific paper titled Direct ink writing of high-resolution cellulose structures , published in Scientific Reports .
These papers often discuss Random Access Response (RAR) procedures in 5G NR (New Radio), specifically for non-terrestrial networks (satellite 5G).
The "RAR" in your query may actually refer to "Random Access Response" rather than the file extension. These files are typically circulated among engineers as ZIP or RAR archives containing technical specifications and proposal documents.
(PDF) Direct ink writing of high-resolution cellulose structures
A study on using cellulose acetate (CA) to 3D-print high-resolution structures.
