Possible Clues:

• ___ Bete (honor society member, informally)
• Angle symbol
• NL East team
• Letter that rhymes with its two successors
• The Phillies, on scoreboards
• Letter in an honor society's name
• 21st of 24 letters
• ____ Beta Kappa
• Letter from the Balkans, far from neutral
• Letter of public house, opening for inspection