Gravel, crushed stone, or slag spread over a railway roadbed to support sleepers, commonly written as [[道碴|道碴|dao4 zha3]] in industry contexts

Small fragments or screenings of coke, typically less than 20mm in size, produced during the production and handling of metallurgical coke

small pieces of coal screened from coal cinders or slack

tiny fragments of stone, coal, or slag; often used for the small pieces screened out of coal cinders

(literary) describes the appearance of mountain rocks being uneven or jagged