You cannot prevent ICON from displaying the grade scheme grade (which is percentage by default). But you can create a new grade scheme that converts all scores in the 0-100 percent range to a meaningless symbol, such as two hyphens. In this case, your students would see the points grade and the hyphens. An illustration of this grading scheme appears under "Sample Grade Schemes" in the Gradebook Online Help section Creating, Modifying, & Applying Grade Schemes.