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.
First, you need to click on the cell that you want to insert the comment into. Then click on the Insert menu option and choose Comment. Just like in 2007, a text box will appear next to the cell where you can enter your comment. Also, a red triangle appears at the upper right hand corner of the cell.dd Comments Using Reviewing Toolbar. Finally, you can use the Reviewing toolbar in Excel to add comments to cells. To open the Reviewing toolbar, go to View, Toolbars, and choose Reviewing. The first icon on the far left is the New Comment button.