a system to taxonomize human facial movements by their appearance on the face, based on a system originally developed by a Swedish anatomist named Carl-Herman Hjortsjö.

The (HCPCS, often pronounced by its acronym as "hick picks") a set of health care procedure codes based on the American Medical Association's Current Procedural Terminology.

an alleged data sharing technique that its inventor claimed could store a complete digital movie file in 8 kilobytes of data— which, if true, would dramatically disprove Shannon's source coding theorem, a widely accepted principle of information theory that predicts how much data compression of a digital file is mathematically possible.

a US system of medical classification used for procedural coding.

a hierarchical code used in the United Kingdom for tabulating census and other statistical data.