What type of marking is used to indicate whether a package should be kept upright?

The marking that indicates whether a package should be kept upright is referred to as the "This Side Up" mark. This specific marking serves the crucial function of guiding handlers about the correct orientation of the package during transport and storage. By signaling which side should remain on top, it helps prevent potential damage to the contents that might occur if the package is placed upside down or on its side.

While the "Fragile Mark" warns handlers that the contents are delicate and should be treated with caution, it does not specify orientation. The "Do Not Stack Mark" advises against placing other packages on top of it, focusing primarily on maintaining the integrity of the package rather than its proper upright position. Similarly, the "Handle with Care Mark" communicates that the items inside require careful handling but does not indicate which side should be facing up. Thus, the "This Side Up" mark is specifically designated for indicating the proper upright position, making it essential for preserving the integrity of the contents during handling and transport.