A surfaced block is a concrete masonry unit with a durable, slick surface designed to provide resistance to frequent scrubbing and cleaning, graffiti, chemical exposure, moisture, impact, and abrasion.
Surfaced block Wikipedia
Common types of surfaced blocks include glazed blocks, tile-faced blocks, sealed ground-face blocks, and polyurethane coated CMU.
Surfaced blocks are found primarily in areas where a sanitary environment is required. Food and Beverage manufacturing plants, hospitals, pharmaceutical manufacturing plants, restaurants, public facilities, and schools use this type of construction material.