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'TID' is a three-letter acronym that may refer to:

★ Tag identification memory, in a Gen 2 RFID tag, this consists of memory about the tag itself, such as the tag ID.

★ Total Ionizing Dose (related to ionizing radiation). Usually measured in ''Gy''.

★ t.i.d. from Latin phrase ''ter in die'' which means thrice-daily dosage