Similar to エナメル芽細胞
 - Open Technology FundOpen Technology Fund
 - OpenSocialOpenSocial
 - OPENSTEPOpenStep
 - OSIグループOSI Group
 - OTL回路Output transformerless
 - Outfit7Outfit7
 - OWLWeb Ontology Language
 - P&G製品一覧List of Procter & Gamble brands
 - P-3 (航空機)Lockheed P-3 Orion
 - P-19 (レーダー)P-19 radar
 - PARRYPARRY
 - PEOPEO
 - Pisaster ochraceusPisaster ochraceus
 - PLUPrice look-up code
 - Power Macintosh G3 (Blue & White)Power Macintosh G3 (Blue and White)
 - PPS短機関銃PPS submachine gun
 - Protoreaster linckiProtoreaster lincki
 - Pseudoceros dimidiatusPseudoceros dimidiatus
 - PubChemPubChem
 - QRコードQR code▼-2 trends
 - R33級飛行船R33-class airship
 - Radeon InstinctAMD Instinct
 - Raft (アルゴリズム)Raft (algorithm)
 - Redbird trainsRedbird trains
 - Registered jackRegistered jack
 - RetroArchRetroArch
 - RK-BroRK-Bro
 - RM-51RM-51