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It can also refer to:
- Rare species, a conservation category in biology designating the scarcity of an organism and implying a threat to its viability.
- Rare (company), a video game development company
- Rare (band), a band from Northern Ireland
- Réseaux Associés pour la Recherche Européenne, a defunct computer networking organisation.
- Ronne Antarctic Research Expedition
- "Rare" can also refer to a particular temperature of meat.