A Silo

1. (agriculture) A vertical building, usually cylindrical, used for the production of silage. Silo - Wikipedia
2. (agriculture) from the shape, a building used for the storage of grain. Synonyms: granary, grain elevator
3. (military) An underground bunker used to hold missiles which may be launched.
4. (derogatory, management) An organizational unit that has poor interaction with other units, negatively affecting overall performance.
5. (derogatory, informatics) A structure in the information system that is poorly networked with other structures, with data exchange hampered.
6. (derogatory, slang) A self-enclosed group of like-minded individuals.
7. (computing) In Microsoft Windows operating systems, a kernel object for isolating groups of threads.