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A glass pipe. The bowl is the large hole on the left side, used to hold smoking material.
A bowl, when referred to in pipe smoking, is the part of a smoking pipe or bong which is used to hold tobacco, cannabis, or other substances. It is also used to refer to an amount of cannabis that would fill a standard-sized bowl on a pipe or bong, and less often as a term for a smoking pipe itself.
See also 
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