Thumbprint
Definition 1 of 1

Identification
A thumbprint is a reliable method for confirming a person's identity.

The bank required her thumbprint to open her account.
Security
Due to its unique nature, thumbprints are used in high-security areas.

Many phones now offer security features that use thumbprints.
Personal Mark
In art, a thumbprint can symbolize individuality.

The artist left her thumbprint on the painting.
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fingerprinthandprintsignature
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