Related Clues:

• Phone call response
• Convention nametag word
• When doubled, popular 1980s-'90s British sitcom
• Name tag word
• Word on a name tag
• Shout into a canyon
• "Wassup," formally
• Other: Pref.
• 'Is this thing on?'
• "Anybody in there?"
• 'What do we have here?!'
• Word on many name tags
• Meeting greeting
• Double this for a 1980s Britcom
• Routine response to telephone call