Related Clues:

• HHH, e.g.
• Greek consonants
• Itinerary info
• Athens' aitches
• Vowels in Athens
• In-flight details, for short
• -
• Some Greek letters
• Fraternity characters
• Diameter symbols, in math
• Greek crosses
• Some sisters
• H H H, to Homer
• Letters used by geometers
• Cross shapes