Letters after omicrons

• Letters used by geometers
• Some Greek letters
• Magnum et al.: Abbr
• Magnum and Ellery Queen: Abbr
• Mathematical symbols
• Rho preceders
• Geometry students' symbols
• Magnum and others: Abbr.
• Greek letters in geometry class

Wikipedia Word definitions in Wikipedia
Pis is a commune in the Gers department in southwestern France .