Related Clues:

• Whispered ''Hey you!''
• Silent indication of approval
• Alternative to being tapped
• Body language
• 'Hey, you'
• Silent say-so
• Emoticon with a semicolon
• Show assent
• 'Hey ... you'
• "Hey, buddy!"
• It's as good as a wink
• Sibilant sound to attract attention furtively
• 'A nod's as good as a .... to a blind horse'
• The Land of ... lay east of Eden
• It's as good as a wink to a blind horse