Quantum mechanics
Quark
Talmud
Received signal strength indication
Rockefeller Center
Regla de la mano derecha
Regla de la mano izquierda
Ditone
Resonance
Torah
Reynolds number
Right-hand rule
Western Wall
Rotation
Rotation around a fixed axis
Wikipedia:Contents/Religion and belief systems
Schrödinger equation
ישו
Schrödinger's cat
9-1-1
SI base unit
يسوع
Solar time
Spacetime topology
Special relativity
Speed of sound
Standard Model
Standing wave
Streamlines, streaklines, and pathlines
Interval (music)