h-index
A researcher-level metric: the largest number h such that they have h publications each cited at least h times.
An h-index of 12 means twelve papers with twelve or more citations each. It was designed to reward sustained output over both a single famous paper and a long list of ignored ones.
Its weaknesses are structural. It can only rise, so it tracks career length as much as impact; it is field-dependent, since citation norms differ by orders of magnitude between disciplines; it ignores author order and contribution; and it differs depending on whether you compute it from Scopus, Web of Science, or Google Scholar, because they index different things.
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See also
Impact factorA journal-level metric: the average number of citations in one year to articles the journal published in the two preceding years.Citation countHow many later publications cite a given work, according to whichever index you ask.ORCID iDA persistent identifier for a researcher, solving the problem that names are neither unique nor stable.