P8

P8 is an alphanumeric designation used in multiple contexts to label equipment, versions, or timepoints. Because it is non-unique, its meaning is determined by the field in which it is used.

In aviation, the P-8 Poseidon is a maritime patrol and anti-submarine warfare aircraft developed by Boeing for the United States Navy. Based on the Boeing 737-800, it first flew in 2009 and entered U.S. service in 2013. It carries advanced sensors, radar, and sonobuoys for maritime reconnaissance and tracking of submarines, and has been deployed by several allied navies.

In computing hardware, P8 refers to a major expansion header on BeagleBone single-board computers. The P8 header, together with the P9 header, provides GPIO pins, power, and other signals used for peripheral connections.

In developmental biology, P8 denotes postnatal day 8, a common timepoint in studies of early development in rodent models.

Notes: P8 appears in other contexts as well, including product model numbers and project designations. The precise meaning depends on the domain.