A "pit pony" refers to a small horse or pony that was historically used to pull coal carts from underground mines. Other terms that could be used as synonyms for pit pony include pit horse, mine pony, coal pony, and colliery pony. These animals were typically smaller in size than regular horses and had a calm temperament that was well-suited for working underground. Due to their important role in coal mining operations, pit ponies were often well-cared for and given special consideration. However, the use of pit ponies in mining has largely been phased out over the years due to advancements in technology and safety concerns.