Standard Block Round plastic building letters are used for outdoor signage of business names or address numbers. The formed plastic 3D letters can be custom made in different sizes and colors. Standard Block is one of the older dimensional letter styles which dates back to the 1920's. Standard block, with its consistent stroke and wide eye openings, is a very readable display font. Standard Block Round has a rounded profile, not flat face, which provides added depth and can be viewed from a wider angle.