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Appearance
- R
- R&B
- R&D
- R'coon Dawg
- R-7
- R-7 (rocket family)
- R-Drive Image
- R-Stroy
- R-Truth
- R- 4808N
- R-dropping
- R-strategists
- R.A.F.
- R.A. Fisher
- R.C.D. Espanyol
- R.C.D. Espanyol de Barcelona
- R.C.D. Español
- R.C.D. La Coruña
- R.C.D. Mallorca
- R.C. Celta de Vigo
- R.C. Deportivo de La Coruña
- R.C. France
- R.C. France Football 92
- R.C. Lens
- R.C. Paris
- R.C. Punnett
- R.C. Recreativo de Huelva
- R.C. Strasbourg
- R.D. Laing
- R.E.M.
- R.E.M. (band)
- R.E.O./T.W.O.
- R.E.O. (album)
- R.E.O. Speedwagon (album)
- R.H. Gomez
- R.I.P.D.
- R.I.P.D. 2: Rise of the Damned
- R.L. Burnside
- R.M.S Titanic
- R.O.B.
- R.O.S.E. (Jessie J album)
- R.P. Lister
- R.S.C. Anderlecht
- R.S. Gavai
- R.S. Ginnastica Torino
- R. A. Fisher
- R. B. Bennett
- R. Budd Dwyer
- R. C. Punnett
- R. C. Soles Jr.
- R. C. Sproul
- R. Ceni
- R. Cornax
- R. D. Call
- R. D. Laing
- R. D. Pradhan
- R. G. Armstrong
- R. H. S. Samaratunga
- R. Hunter Middleton
- R. J. Umberger
- R. James Harvey
- R. K. Laxman
- R. K. Mathur
- R. K. Narayan
- R. Kelly
- R. L. Bhatia
- R. L. Burnside
- R. L. Stine
- R. Lee Ermey
- R. Lee Wrights
- R. Murray Schafer
- R. N. Ravi
- R. Nagaswamy
- R. Nicholas Burns
- R. P. Lister
- R. P. M.
- R. R. Patil
- R. S. Gavai
- R. Sampanthan
- R. Sathyanarayana
- R. Scott Bakker
- R. Standard de Liège
- R. Stephen Berry
- R. Toros
- R. Venkataraman
- R. Vidyasagar Rao
- R/K selection theory
- R/The Donald
- R101
- R11: Highly flammable
- R12: Extremely flammable
- R136a1
- R136c
- R142A (New York City Subway Car)
- R142A (New York City Subway car)
- R142 (New York City Subway car)
- R143 (New York City Subway Car)
- R143 (New York City Subway car)
- R160 (New York City Subway car)
- R179 (New York City Subway car)
- R179 ( New York City Subway Car)
- R188 (New York City Subway Cars)
- R1a1
- R1a1 (Y-DNA)
- R2-D2
- R20/21/22: Harmful by inhalation, in contact with skin and if swallowed
- R20/22: Harmful by inhalation and if swallowed
- R20: Harmful by inhalation
- R211 (New York City Subway car)
- R21: Harmful in contact with skin
- R22: Harmful if swallowed
- R23/24/25: Toxic by inhalation, in contact with skin and if swallowed
- R23/25: Toxic by inhalation and if swallowed
- R23: Toxic by inhalation
- R24: Toxic in contact with skin
- R25: Toxic if swallowed
- R26/27/28: Very toxic by inhalation, in contact with skin and if swallowed
- R26/28: Very toxic by inhalation and if swallowed
- R26: Very toxic by inhalation
- R28: Very toxic if swallowed
- R2K
- R3.0
- R31: Contact with acids liberates toxic gas
- R33: Danger of cumulative effects
- R35: Causes severe burns
- R36/37/38: Irritating to eyes, respiratory system and skin
- R36: Irritating to eyes
- R38: Irritating to skin
- R40: Limited evidence of a carcinogenic effect
- R41: Risk of serious damage to eyes
- R42/43: May cause sensitization by inhalation and skin contact
- R43: May cause sensitisation by skin contact
- R46 (New York City Subway car)
- R48/23: Toxic: danger of serious damage to health by prolonged exposure through inhalation
- R48: Danger of serious damage to health by prolonged exposure
- R49: May cause cancer by inhalation
- R4 assault rifle
- R50/53: Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment
- R50: Very toxic to aquatic organisms
- R51/53: Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment
- R52/53: Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment
- R59: Dangerous for the ozone layer
- R60: May impair fertility
- R61: May cause harm to the unborn child
- R62: Possible risk of impaired fertility
- R62A (New York City Subway car)
- R62 (New York City Subway car)
- R65: Harmful: may cause lung damage if swallowed
- R66: Repeated exposure may cause skin dryness or cracking
- R67: Vapours may cause drowsiness and dizziness
- R68: Possible risk of irreversible effects
- R700
- R71
- R77
- R9
- RAAF
- RAAN
- RAAS
- RADA
- RADAR
- RADWIMPS
- RAF
- RAF (disambiguation)
- RAF Down Ampney
- RAH
- RAI
- RAID
- RAM
- RAM Rebel truck
- RAN
- RAND Corporation
- RAR
- RAR (disambiguation)
- RAR (file format)
- RAS syndrome
- RATM
- RATP Group
- RAW
- RAW (Hopsin album)
- RAmen
- RBC Center
- RBCs
- RBD
- RBG
- RBI
- RBLX
- RBMK
- RB Leipzig
- RB Sports & Media
- RC2
- RC4
- RC5
- RC6
- RCA
- RCA/Columbia Pictures Home Video
- RCA Records
- RCA Records Nashville
- RCA Red Seal Records
- RCA Studio II
- RCA connector
- RCCB
- RCD
- RCDB
- RCD Espanyol
- RCD Mallorca
- RCEP
- RCM
- RCMP
- RCN Nuestra Tele Internacional
- RCN Televisión
- RCT
- RCTV
- RC Bafoussam
- RC Celta de Vigo
- RC Cola
- RC Lens
- RC Strasbourg Alsace
- RDBMS
- RDR2
- RDRII
- RDR 2
- RDR II
- RDS
- RDS Group
- RED (movie)
- RED Air Flight 203
- RED C
- REM
- REM behaviour disorder
- REM sleep
- REN21
- REO Speedwagon
- REO Speedwagon discography
- RERO (identifier)
- REST API
- RESTful
- REWE Group
- RF
- RFC822
- RFC (identifier)
- RFC 2822
- RFC 822
- RFC Liège
- RFD-TV
- RFG
- RFID
- RFK
- RF modulator
- RG3
- RGB
- RGB LED
- RGB color model
- RHCP
- RHEL
- RHTV
- RIAA
- RIAA certification
- RIAA certifications
- RIAA equalization
- RIANZ
- RIM-7 Sea Sparrow
- RINO
- RIOT!
- RIP Roach
- RIR
- RIRs
- RISC
- RIU
- RIU Hotels
- RJ Mitte
- RKKF
- RKO
- RKO Films
- RKO Pictures
- RLC circuit
- RLE
- RLY
- RM4SCC
- RMB
- RMJM
- RMNP
- RMS
- RMS4CC
- RMS Carpathia
- RMS Empress of Ireland
- RMS Lusitania
- RMS Olympic
- RMS Queen Mary
- RMS Queen Mary 2
- RMS Slavonia
- RMS Titanic
- RMS 올림픽
- RM (rapper)
- RN
- RNA
- RNA-Seq
- RNA interference
- RNA polymerase
- RNA splicing
- RNA translation
- RNA vaccine
- RNA virus
- RNA world hypothesis
- RNAi
- RNC
- RNCP
- RNE
- RNase
- ROBLOX
- ROC
- ROFLMAO
- ROH
- ROK
- ROKS Yeosu
- ROM
- ROM (disambiguation)
- ROM cartridge
- ROT-13
- ROT13
- ROTC
- ROYGBIV
- RP
- RPD machine gun
- RPG
- RPG-26
- RPG Maker
- RPI
- RPK
- RPK machine gun
- RPM
- RPM (disambiguation)
- RPM (magazine)
- RPM Package Manager
- RPO
- RPP
- RPTV (TV channel)
- RP Lister
- RRNA
- RRR (film)
- RRR (movie)
- RR Lyrae
- RR Lyrae variable
- RR Lyrae variables
- RSA
- RSA (algorithm)