A sounding rod can refer to two different things:
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Sounding rod for measuring water depth: In the context of ships, a sounding rod is a rod or piece of iron used to determine the depth of water in a ships hold. It is lowered into the water by a pump and provides information about the water depth.
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Sounding rod for urethral play: In the context of sexual practices, a sounding rod is a type of sex toy used for urethral sounding. Urethral sounding is the practice of inserting a long, thin rod into the urethral opening for sexual pleasure or exploration. These rods are typically made of surgical steel and may have various shapes and sizes.