Related Clues:

• No.
• Book
• Digit, cipher
• Quantity of a book?
• Mathematical unit
• Intensity of sound, in a book?
• Symbol or hallmark
• Digit, integer
• 1,2,3, for instance
• Count - a digit?
• Magnitude of sound
• Space occupied by an object
• A book or sound dimension
• Space measured in cubic units
• Symbol indicating how many