楼主

Traditional form:

樓主

Pinyin (reading):

lóuzhǔ

Definitions:

• original poster (in an online forum)
• landlord of a building (traditional)

Characters:

• 楼 - multi-story building; floor
• 主 - to own; to host; master; host; lord

Traditional characters:

• 樓 - multi-story building; floor
• 主 - to own; to host; master; host; lord