stovepipe

noun

Etymology: From stove + pipe. The firearms sense is due to the trapped cartridge case resembling a stovepipe of the stove sense.

Sheet-metal tubing used as a chimney for a stove or furnace.
“On the Visby-Västerhejde Railway there is a steam car. [...] The upperworks consist of a short clerestory coach body with end platforms and the engine chimney protruding from the roof like a stovepipe.”
“Glass windows replaced the old tiny windows of selenite (crystallized gypsum), and stovepipe replaced adobe chimneys.”
A channel for information which is compartmentalized in such a manner that some parties who might be interested in its use or able to make use of it are restricted from accessing it.
A stovepipe hat.
“I'm sure the Brunel-designed stone-built structure would have had a hatstand for his trademark stovepipe. I can picture him rocking up there of a morning and lobbing it nonchalantly onto the hatstand.”
A type of malfunction affecting breechloading firearms, where a spent cartridge casing fails to eject completely, instead becoming stuck in the firearm's ejection port, usually oriented vertically or nearly so.
A trench mortar such as the Stokes mortar.

Etymology: From stove + pipe. The firearms sense is due to the trapped cartridge case resembling a stovepipe of the stove sense.

To collect or store (information) in a compartmentalized manner, so that some parties who might be interested in its use or able to make use of it are restricted from accessing it.
Of a cartridge case, to become wedged vertically in the ejection port of a breechloading firearm, rather than ejecting completely from the weapon.