Blood Type Compatibility. Your ABO blood type is based on the presence or absence of the A and B antigens on your red blood cells. The A blood type has only the A antigen and the B blood type has only the B antigen. The AB blood type has both A and B antigens, and the O blood type has neither A nor B antigen.
Green Triangle. The green triangle appears in the upper left hand corner of a cell when there is an error in a formula. Sometimes Excel will report an error when you use text in a box and the program believes it is part of a formula. When you click on the green triangle there will be a yellow box that looks like a road sign with an exclamation point in it. This button is the Trace Error option that will help you correct your formula.
Excel Tips Tutorial: How to Use Trim, Upper, Lower and Proper In Microsoft Excel. Excel Tips Tutorial: How to Convert a PDF File to Editable Excel File. Excel Tips Tutorial: How to Use Pivot Tables in Microsoft Excel. Excel Tips Tutorial: How to Find and Select Content or Cells in Excel.