Related Clues:

• Brief communication
• Interoffice e-mail, maybe
• Urgent request
• Easter symbol
• Urgent letters?
• Distress call
• Shorthand system
• ···---···
• Coat or skirt preceder
• "Send help!"
• Distress letters
• Certain smoke signal
• Interoffice communiqui
• Plea at sea
• Rescue request