tagger

One who or that which tags.

The player who tries to catch others in the game of tag.

One who or that which tags.

A person who writes graffiti using a specific mark

One who or that which tags.

A program or algorithm that adds tags for purposes of categorization, e.g. grammatical information to words in a document, or genres to songs in a music collection.

A device for removing taglocks from sheep.

That which is pointed like a tag.

The penis.

Sheets of tin or other plate which run below the gauge.