morning star

noun2

1. •
   A weapon consisting of a heavy ball set with spikes attached rigidly to a staff, in contrast to a flail.

   • Contrivances like these, except that the balls were armed with spikes, were long carried by the pioneers of the trained bands, or city militia, they are generally called morning stars. — 1786
2. •
   (Philippines, Hong-Kong) Sleep or rheum, particularly that which is discharged at the eyes during sleep.

   • We call it “morning star”. Funny name though. The real name is “eye crusts”. — 2019