East Asian coal briquettes (Japanese: 練炭, Hepburn: rentan), also 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 home cooking and residential home heating purposes.

Made from a mixture of lignite coal dust and a gluing agent that keeps the dust particles together,[1] they became a popular alternative to firewood and natural coal because they come in a consistent size and stack easily.

Introduced to Korea from Japan in the 1920s, yeontan rose in popularity following the Korean War.

[1] The boilers reduced the risk of carbon monoxide poisoning, which was a major cause of death in coal-heated houses.

[2] A number of suicides in south Korea have seen the use of yeontan for carbon monoxide poisoning.