1852.6232 is a technical publication of Mentor Graphics, an American company that provides computer-aided design and embedded software tools. It is the latest version of their Xcalibur System Canals library, which provides a comprehensive set of components and rules that can be used to create custom IC (integrated circuit) designs. The library contains a full set of physical design elements such as pads, traces, vias, etc., as well as connectivity rules, pin assignment rules, and other useful information. It also provides a powerful API and other utilities to simplify the IC design process.