Page 31, Column 3, Paragraph(s) 8, Core Rule Book
Tag: A token acquired by the Runner that can allow the Corporation to trash the Runner's resources.

A tag is a token the Runner can collect through various card abilities and effects. As long as the Runner has at least one tag, s/he is considered tagged and can have his/her resources trashed by the Corporation. Some card abilities and effects can also be triggered or made available while the Runner is tagged.

Page 20, Column 2, Paragraph(s) 1, Core Rule Book
Certain card effects result in a tag being placed on the Runner.
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