A Persistent Identifier PID is a permanent (persistent) digital identifier, consisting of numbers and/or alphanumeric characters, which is assigned to a record (or other digital object) and refers directly to it.

These include:

DOI Digital Object Identifier - ID for scientific results (publications and research data).

    https://doi.org/10.5281/zenodo.8178870

ORCID Open Researcher and Contributor ID - personal ID for scientists and scholars

    https://doi.org/10.5281/zenodo.8178750

ROR Research Organization Registry - ID for organisations in the scientific field

    https://doi.org/10.5281/zenodo.8178605