A tessellation is a shape that can be used to completely fill the plane—simple examples are isosceles triangles, squares, and hexagons. Tessellation patterns are eye-catching and visually appealing, which is the reason that they have long been popular in a variety of decorative situations, such as quilting.
The TessieLetters fonts contain letter shapes that can be used to construct tessellation patterns. Each family has two styles, an outline style and a filled or black style. The black style can be used to construct colored patterns. To see how patterns can be constructed, see the files here for TessieLettersACE, TessieLettersFQ, TessieLettersGJKMN, TessieLettersLL, TessieLettersTT, TessieLettersOSZ, and TessieLettersSingles. Many or these patterns were discovered/created by the font designer during the past twenty years in the process of designing maze books, coloring books, and a book about tessellations.
The TessieLetters are picture or dingbat fonts. For fonts of tessellating letter shapes that can be used for text, see the Tescellations family.