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.