Here's a symbol for the Knights of the Sun. It plays on the Claravian Star and Gear. The spikes represent both sun rays and a spiked tail weapon, which as stated in the Commonthroat thread, has similar symbolic value to yinrih as swords do for humans.

Hearthside's military may be composed entirely of Knights..

Just as European Knights are associated with cavalry, I suspect the Yinrih notion of knighthood is associated with mechs and heavy powered armor. That doesn't mean every knight is a mech pilot, but Lodestar certainly is.