[princevegeta89]

A Pulsar, that's not really spinning but oscillating back and forth, becoming a very highly precise instrument of time measurement as well:

https://physicsworld.com/a/pulsar-timekeepers-measure-up-to-...

[ISL]

Pulsars are dense compact spinning objects.

From your link: "Pulsars are neutron stars that rotate at very high speeds and appear to emit radio pulses at extremely regular intervals. The pulses are actually all we see of a radio beam that is focused by the star’s magnetic field and swept around like a lighthouse beacon."