Related Clues:

• Late alphabetic sequence
• L-P center
• Pre-U queue
• 18 to 20 in a sequence
• Trio on a phone keypad
• 6 string
• They'll come before U
• 6, on a cellphone button
• Letters above WXYZ
• Phone button sequence
• Quartet after Q
• Q trailers
• Queue between Q and U
• Sequence after JKL
• Sequence often seen above WXYZ