ASME Y14.100 : Engineering Drawing Practices
A document produced by a company that establishes engineering and technical limitations and applications for items, materials, processes, methods, designs, and engineering practices unique to that particular company.
Alternate Definitions:

MIL-STD-31000B - A company document, which establishes engineering and technical limitations and applications for items, materials, processes, methods, designs and engineering practices unique to that company. NOTE: Company standards are not considered to be non-Government standards.