1. Official classification for documents; meant to be seen by only the person to whom it is directed

See also: classified

• Schrödinger equation
• Schrödinger wave equation
• Schrödinger's cat
• schtick
• schtickl
• schtik
• schtikl
• schtum
• Schubert
• Schuller-Christian disease
• Schulz
• Schumann
• Schumann-Heink
• Schumpeter
• schuss
• Schutzstaffel
• schwa
• Schwann
• Schwann cell
• Schwarzwald
• Schweitzer
• Schweiz
• Schönberg
• sci-fi
• Sciadopityaceae