Your ORCID iD is a unique, open digital identifier that distinguishes you from every other researcher with the same or a similar name to you.

Anyone who participates in research, scholarship, or innovation can register an ORCID iD for themselves free of charge, and you can use the same iD throughout your whole career -- even if your name changes or you move to a different organization, discipline, or country.

https://support.orcid.org/hc/en-us/articles/360006897334-What-is-my-ORCID-iD-and-how-should-I-use-it-

Click here if you forgot your ORCID iD: https://support.orcid.org/hc/en-us/articles/360042767454