(n.) (logical unit number) See major/minor device numbers.

(Logical Unit Number) A SCSI identifier within a target assigned to each FC accessible disk so that the host can address and access the data on those devices.

Logical Unit Number or Logical Unit; a subdivision of a SCSI target. For SCSI-3, each SCSI target supports up to sixteen LUNs (LUN-0 to LUN-16). Using LUNs, the FC host can address multiple peripheral devices that may share a common controller.

INTE FORTRAN logical unit number.