There are four possible combinations of blood types namely: Type A (only antigen A), Type B (only antigen B), Type AB (both antigens A and B), and Type O (neither antigens A nor B). This is referred to as the ABO blood typing system. In addition, red blood cells have a Rhesus factor or Rh, which is either present or absent. If the Rh factor is present, the cells are referred to as Rh positive.
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Designated for assignment. Designated for assignment (or DFA) is a contractual term used in Major League Baseball. A player who is designated for assignment is immediately removed from the team's 40-man roster, after which the team must choose either of the following options: 1  A. Return the player to the 40-man roster within 10 days from the date of designation.