@beonespirit Those three additional lines form a “cross” with the seconds hand, inspired by the design of the original K-14 marine compass.
suunto_k-14.jpg
In the compass, the purpose of the cross is to enhance readability and orientation at a glance; for me, it particularly improves interpretation from inclined viewing angles.
However, in the context of the watchface, I believe it primarily serves as an interesting design element.