Korean unit of measurement referring to the square space created by 4 wooden posts in a traditional building   (roughly 6~8 feet from post to post depending on the available length of the wooden posts)

Source: adapated from Hanoak Traditional Korean Homes 

wooden floor; open summer room; veranda

A hypocaust heating system / radiant subfloor heating system.  In traditional Korean homes, heat from a kitchen's hearth would be guided through a series of flues underneath the bedroom floor before venting out the chimney, thus, cooking heat had dual purpose during winter - to prepare meals and to heat the interior rooms. 

A unit of measurement in Korea equal to 400⁄121 square metres (3.3058 m2, 3.954 sq yd or 35.586 sq ft). The similar unit of measurement in Japan is the tsubo (坪). It is used most often in referring to the sizes of rooms or buildings; a studio apartment will generally be around 10 to 15 pyeong, a house somewhere around 50 or more, and the smallest of rooms, consisting of only a bed and a bit of floor space for students, will be as little as 1.5 pyeong.

Anecdotally, the unit was derived from the amount of space an average sized man would take up lying on the floor with his arms and legs spread out.

One pyeong consists of 36 square ja.

A new law enacted as of July 1, 2007 will replace the use of pyeong in official documents in South Korea with the square metre.

Source:  Wikipedia 

A traditional unit of distance measurement in Korea.  One ri is approximately 2.5 km or 1.55 mile. 


Source:  Wikipedia