In some editions of Samguk Yusa, one of the oldest surviving Korean history books, the name Hwanin (桓因), the mythical grandfather of Gojoseon's founder Dangun, is written in different characters such as 囯 or 囗+士(a character with 士 written inside 囗, not supported by Unicode) to represent the character 因.
In some versions of Samguk Yusa, the name Hwanin (桓因) representing the character 因 is represented by different characters such as 囯 or 囗+士.