Sign a greeting card with meaningful words according to the occasion the card is meant for. Different occasions require certain phrases, words of encouragement or celebratory comments.
Religious and sympathy cards can be signed with words of sorrow or prayer such as "God Bless" or "Our Deepest Condolences." Birthday cards are signed with words of celebration as simple as "Happy Birthday." Graduation, promotions, retirement or life achievement greeting cards are signed with "Congratulations," "Well Done," or other words of encouragement.
Thank you cards are signed with "Thank You." Depending on the occasion, you might write "Thank You for Attending," or "Thank You for Being There." Business cards should be professional and signed with short phrases such as "Congratulations," "Welcome to the Team," or words that fit the occasion.