Related Clues:

• Abbr. not found on most smartphones
• Abbr. between * and #
• Abbr. next to a star
• Phone dial abbr
• Letters with 0
• Button beside #
• Any Wagnerian masterwork
• Letters paired with zero on a button
• Letters no longer seen on most phones
• Abbr. on a 0 button
• 0 letters, on a telephone
• Abbr. below '0' on a phone
• Letters seen between * and #
• Abbr. next to 0, on an old phone
• Letters by ''0'' on old phones