Checkmark in Cells
You can place a checkmark in a cell by formatting the cell to Webdings and placing the lowercase letter a in the cell.

You can place a checkmark in a cell by formatting the cell to Webdings and placing the lowercase letter a in the cell.

It did not come out as you posted.
It should be webdings, instead of windings.
I was playing with a number of fonts last night and got the wires crossed. Thanks noCow, I’ve updated the post.