(1) A name.
(2) For mass storage devices, a label is the name of a storage volume. It is sometimes referred to as a volume label. Each operating system has its own set of rules for labeling volumes. The label provides a mnemonic name that indicates what type of information is stored on the media.
(5) The term label is also commonly used to mean a small, sticky piece of paper that you can place on an object to identify it. For example, you can paste labels on floppy disks to indicate what data is stored on them.