tar

Tar is a black mixture of hydrocarbons and free carbon  obtained from a wide variety of organic materials through destructive distillation. Tar can be produced from coal, wood, petroleum, or peat. Production and trade in pine-derived tar was a major contributor in the economies of Northern Europe and Colonial America. Its main use was in preserving wooden vessels against rot. The largest user was the Royal Navy. Demand for tar declined with the advent of iron and steel ships.

In computing, tar is a computer software utility for collecting many files into one archive file, often referred to as a tarball, for distribution or backup purposes. The name is derived from tape archive, as it was originally developed to write data to sequential I/O devices. The archive data sets created by tar contain various file system parameters, such as time stamps, ownership, file access permissions, and  directory organization. The file structure to store this information was later standardized in POSIX.1-1988 and later POSIX.1-2001. and became a format supported by most modern file archiving systems.

Tar is a viscous organic black liquid.

Time at Risk (TaR) is a time-based risk measure designed for corporate finance practice.