bowl and shank of a Japanese pipe
Refers specifically to the metal head of a kiseru (Japanese pipe), consisting of the bowl and the shank.
The bowl and shank of my grandfather's keepsake kiseru are made of silver.
Colloquial, somewhat rough or jocular term for a person's neck or head. Often used in phrases like 雁首をそろえる (to line up together, often with a negative nuance).
Those guys are lining up together again, plotting something.
He's walking along, drunk, swaying his head.
Carpesium divaricatum (flowering plant)
Standard kanji spelling for both the pipe part and the colloquial neck sense.
Alternate spelling using がん for the first character; less common than 雁首.
Literally 'goose neck', from the resemblance of the curved pipe head to a goose's neck. The colloquial sense for a person's neck is a metaphorical extension.