(1) A topic identifier. See
hashtag.
(2) A code used in a markup language. See
tagged text,
HTML tag,
character tag and
paragraph tag.
(3) See
RFID tag and
smart tags.
(4) A set of bits or characters that identifies various conditions about data in a file and is often found in the header records of such files. This type of tag identifies the entire file, and the tags occupy predefined locations in the header rather than embedded throughout the file.
(5) A name (label, mnemonic) assigned to a data structure, such as a field or record. See
XML document.
(6) A descriptive field in a music or video file. See
ID3 tag.
(7) A field that identifies the contents of a data record. See
key field.
(8) A brass pin on a terminal block that is connected to a wire by soldering or wire wrapping.