Which designation indicates a casket that has a specific shape with sides that are vertical?

The designation that indicates a casket with sides that are vertical is the flaring square casket. This type of casket features a design where the sides are straight and perpendicular to the base, which contributes to its vertical appearance. It is distinguished by its geometric form, typically with a flat lid and sides that do not taper, giving it a box-like shape.

In contrast, the other choices represent different styles or shapes. A state casket typically refers to a casket used for formal state funerals and does not specifically describe the shape. An urn-shaped casket, as the name implies, has a design resembling an urn, which is not characterized by vertical sides. The octagon casket features an eight-sided shape, which also deviates from the vertical side profile.

Understanding casket designs is important in mortuary administration, as it helps funeral service providers recommend appropriate options for families during a time of loss.