Possible Clues:

• What circled R's may indicate: Abbr
• Crock-Pot and Cuisinart: Abbr
• Eggo and Lego: Abbr.
• Registered names: Abbr.
• Band-Aid and Barbie, e.g.: Abbr.
• Co. ID's
• Product symbols (abbr.)
• They often accompany logos: Abbr.
• Corp. logos, e.g.
• Protected images, for short