https://www.theregister.co.uk/2018/10/18/google_hardens_pixel3/

People in the Googleplex need to talk to each other more: the Chocolate Factory has launched a third product with “Titan” in its name, and it's only related to one of the other two bits of kit.

The latest Titan to be welcomed by a waiting world is Titan M; a custom chip that adds extra security features to Mountain View's Pixel 3 smartphones. This should not be confused with the Titan Security Key, Google's two-factor authentication dongle, but it's related to Titan, a custom security chip used in Google's data centers. Hope that's clear.