Possible Clues:

• Symbol representing abnormal movement in earth satellite
• Smiley in an email, e.g
• Small show of one's feelings
• Cue for the tenor, perhaps
• Figure whose colon might be part of his face?
• English poet ringing about text messaging symbol?
• :) or :(
• Feeling upon receiving Charlie's messaging symbol
• Mysterious notice inscribed with second digital symbol
• Expression for your mood