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Tag (graffiti), a form of graffiti signature •
Dog tag, an ID tag worn by military personnel •
Ear tag, an ID tag worn by farm animals •
Electronic tagging, a form of surveillance using a device attached to a person or vehicle •
Kimball tag, predecessor to the barcode, used to identify products to a stock control system •
Pet tag, an ID tag worn by pets •
Price tag, a label declaring the price of an item for sale •
QR code or mobile tag, a type of matrix barcode •
RFID tag, passive electronic inventory stock control technology •
Toe tag, an ID tag worn by dead bodies in the morgue •
Triage tag, a tool used to classify victims of mass casualty incidents •
Tagging (stamp), the printing of postage stamps on luminescent paper or with luminescent ink to facilitate automated mail processing ==People and characters==