Related Clues:

• "Hello-o-o-o!"
• "You there!"
• Sly summons
• 'Hey! Come over here!'
• (Hey there!)
• Start of a library conversation, maybe
• 'Hey ... this way!'
• 'Hey, c'mere!'
• "Hey, c'mere!"
• Sound akin to a tap on the shoulder
• Quiet form of 'Hey!'
• Summons that may precede a poke
• Discreet 'hey!'
• Attention-getting sound you may hear in a library
• "Hey," in the library