a yellow circle, indicating this line as the governing ruler of the hexagram Nine in the fifth place means:

Resolute conduct.
Perseverance with awareness of danger.

This refers to the ruler of the hexagram as a whole. One sees that one has to be resolute in conduct. But at the same time one must remain conscious of the danger connected with such resoluteness, especially if it is to be persevered in. Only awareness of the danger makes success possible.