marked for identification

Definition from Nolo’s Plain-English Law Dictionary

Documents or objects presented during a trial before testimony confirms their authenticity or relevancy. Each item is given an exhibit identification letter or number, and can then be physically marked and referred to by that letter or number. The marked exhibits can be introduced into evidence (made part of the official record) upon request of the lawyer offering the evidence and approval by the judge or by stipulation of both attorneys.

Definition provided by Nolo’s Plain-English Law Dictionary.