What is the abbreviation of fo?

FO(Free out) means that the ship does not bear the unloading fee, which is a special word commonly used by customs. FO (front office) is the abbreviation of front office in a hotel, which is a professional term of the hotel.

Follow (FO for short): refers to following. After paying attention, you can see the news of the people who are concerned in the timeline. FO: (fail-open) means fail-open in automatic control.