Single-anonymized review
Author is does not know reviewer. Reviewer knows identity and affiliations of author.
Double-anonymized review
Both the author(s) and reviewer(s) are unaware of each others’ identities and affiliations.
Triple-anonymized review
Reviewers are anonymous. Authors’ identities are unknown both to the reviewers and to the handling journal editor.
Open peer review
Both the author(s) and reviewer(s) know each others’ identities and affiliations