Related Clues:

• Theta-kappa go-between
• Itty-bitty bit
• First half of the files?
• Physics subject
• Scribble (down)
• Smashed item
• See 63-Across
• Musical symbol
• Tiny part
• She comes to a full stop
• Bit of Braille
• Molecule component
• Stud
• Morse morsel
• Make note of