Remove green mark upper left several cells Excel?

I have a green mark in the upper left of each cell after a calculation.
Anyone know what do they mean and how can I remove them?

Go to Tools>Options>Error checking. You'll see the sorts of things that
Excel flags as possible errors. You can toggle the options under rules, or
just turn it off altogether


"George" wrote:

> I have a green mark in the upper left of each cell after a calculation.
> Anyone know what do they mean and how can I remove them?