Related Clues:

• Only two alphabet letters have them
• A colon has two
• Polka __ (fabric pattern)
• They go with dashes
• Classic pencil-and-paper game
• F F F
• .…
• Morse code elements
• Morse signals
• 'i' toppers
• Telegraph clicks
• Symbols for Ts
• Round specks
• Some Morse code clicks
• Ellipsis, basically