Geometric dimensioning and tolerancing (GD&T) is a system for defining and communicating engineering tolerances. It uses a symbolic language on engineering drawings and computer-generated three-dimensional solid models that explicitly describe nominal geometry and its allowable variation. This highly specialized symbol font is designed specifically to be used by engineers to describe CAD produced outside the CAD environment. Included is a chart featuring character names and keyboard placement. Complies with ASME Y14.5M-1994. Updated to include 2009 addition of ‘unilateral’ symbol.

In the 1960 edition of Sam Welo’s “Studio Handbook – Letter and Design for Artists and Advertisers” is a stylized, condensed slab serif alphabet he referred to as “Poster Slab”. This has been digitally redrawn as Poster Moderne JNL, and is available in both regular and oblique versions.