Flag Pole
From Kerbal Space Program Wiki
The flagpoles are two structures at the Kerbal Space Center and show the default flag for the current session. One is located in front of the Astronaut Complex while another is located at the launch pad.
Only the flagpole at the Astronaut Complex can be used to select the default flag for missions.
Trivia
- The flagpole at the Astronaut Complex can be climbed.