; and (B) has a contrast percentage of at least 70 percent between such symbol or label notice and the background, using the formula (B1 - B2) / B1 * 100 = contrast percentage, where B1 is the light reflectance value of the lighter area and B2 is the light reflectance value of the darker area. (6) Label notice The term label notice means the written phrase Do Not Flush . (7) Principal display panel The term principal display panel means the side of a product package that is most likely to be displayed, presented, or shown under customary conditions of display for retail sale, and— (A) in the case of a cylindrical or near-cylindrical package, the surface area of which constitutes at least 40 percent of the product package, as measured by multiplying the height by the circumference of the package; or (B) in the case of a flexible film package in which a rectangular prism or near-rectangular prism stack of wipes is housed within the film, the surface area of which is measured by multiplying the length by the width of the side of the package when the flexible packaging film is pressed flat against the stack of wipes on all sides of the stack. (8) Symbol The term symbol means the Do Not Flush symbol, as depicted in the Guidelines for Assessing the Flushability of Disposable Nonwoven Products (Edition 4; May 2018) published by the Association of the Nonwoven Fabrics Industry (INDA) and the European Disposables And Nonwovens Association (EDANA), or an otherwise identical symbol depicting an individual of another gender.