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In welding terminology, the reference line is a critical component of a welding symbol used to convey information about the weld to be completed. Specifically, the information that appears below the reference line indicates the positioning of a weld symbol relative to the joint being welded.

When a weld symbol appears below the reference line, it signifies that the welding operation needs to be performed on the side of the joint that is closest to the arrow of the welding symbol. This is often referred to as the "arrow side." Therefore, selecting the answer that states the information shown below the reference line refers to a weld "made on the arrow side" accurately reflects the standardized meaning in welding practices. Understanding this helps welders accurately interpret welding symbols to ensure proper execution of welds according to specifications.