known by the names yeontan (Korean: 연탄) or fēngwōméi (Chinese: 蜂窩煤; Chinese: 蜂窝煤, literally "beehive coal"), are coal briquettes used across East Asia for
cylindrical briquettes, called "fēng wō méi" (beehive coal 蜂窩煤 / 蜂窝煤) or "Mei" (coal 煤) or "liàn tàn" (kneaded coal 練炭 / 练炭), are used in purpose-built