The icons on POF have different meanings. The green circle icon indicates that a user is online and available. The yellow circle icon means the user was recently online but may not be currently active. The blue checkmark icon signifies that a user's profile has been verified. The purple half moon icon indicates that a user has enabled the "Meet Me" feature and is open to meeting new people. The red cross icon suggests that a user has blocked you, preventing any further communication. The crown icon is found on profiles of members who have upgraded to the premium subscription. It signifies that they have access to additional features and benefits. Finally, the gold heart icon indicates that a user has added you to their favorites list. These icons help users understand the status, availability, and preferences of other members on POF.