Korean Family Titles
삼촌
samchon · Uncle (father's unmarried younger brother)
Relationship
my father → his younger brother, still single
Who uses it
About your father's younger brother before he marries.
When you call them
Call him 삼촌. After he marries, the standard title becomes 작은아버지.
When you talk about them
To others, 삼촌.
Example
삼촌이 게임기 사 줬어!My uncle bought me a game console!
Based on the standard etiquette of the National Institute of Korean Language; families and regions vary.