Sorority members such as Ann-Margret and Laura Bush

• Sorority letters
• Angle symbols, in math class
• Greek letters used for angles in math
• Some sorority women
• Greeks' "unlucky" letters
• Trigonometry symbols
• Greek characters leaving the job unfinished
• Angle symbols, in geometry

Wiktionary Word definitions in Wiktionary
n. (plural of theta English)