What is symbol for depth?

The symbol for depth is often represented using a downward pointing arrow or triangle. The depth symbol typically indicates the vertical measurement of a surface or object below a reference point such as the water level in a body of water or the surface of the ground. This symbol is commonly used in various industries including construction, engineering, and mapmaking to indicate the depth of a particular feature or point of interest. In some cases, the depth symbol may also be accompanied by numerical measurements in units such as feet, meters, or fathoms to provide more specific information about the depth being represented.