Related Clues:

• A or O, at the blood bank
• Important transfusion datum
• Compose, in a way
• Use an Underwood
• Keyboard
• Blood __
• Disclosure to a dating service
• Sort or kind
• Blood category
• Rockwell or Gothic
• Texters do it
• Use a keyboard, maybe
• Enter with a keyboard
• Thing or person of a specified kind
• Printed characters