Slab serifs have thick, rectangular terminal strokes with minimal or no bracketing connecting them to the main stroke. They evolved from early 19th-century advertising type and carry connotations of industrial strength, reliability, and forthright communication.
Roboto Slab, Zilla Slab, and Bitter are widely used free options. On the premium side, Sentinel, Rockwell, and Clarendon are classics, while more contemporary choices like Adelle and Museo Slab offer versatility from body text through to headline sizes.