The Key Position field refers to where the backslash (\) is placed in the Name field of an organization constituent record.

For example, a constituent named The ABC Company who has a value of The\ABC Company in the Name field, has a Key Position value of 4, since the organization has a backslash in the 4th character of its name.

The backslash allows The Raiser's Edge to read the record as "ABC Company" so the "The" does not have to be included in order to search for the record.