Multilingual.

PTC Mathcad has all your engineering notebook?s ease-of-use and familiarity - combined with live mathematical notation, units intelligence, and powerful calculation capabilities. This engineering math software allows you to present your calculations with plots, graphs, text, and images in a single document. Nobody needs specialized skills to understand PTC Mathcad data, and now that your intellectual property has been preserved, you can leverage it for other projects.

http://www.ptc.com/products/mathcad/