Fujitsu MAP3147 Scsi Logical Interface Specifications page 270

Glossary
Initiator (INIT)
This is a SCSI device which initiates input and output operations on the SCSI bus.
In this manual, initiator has been abbreviated to "INIT."
Logical Unit
This is the device unit which is the object of input/output operations on the SCSI
bus.
LUN
Logical Unit Number
This is the serial number which identifies a logical unit.
Message
This is control information that is delivered and received between the initiators
and targets operating on the SCSI bus for controlling a series of bus phases and
input/output operation execution sequences.
Reconnect
For a target which has executed disconnect processing, this is processing which
reconnects tot he initiator at the point when operations on the SCSI bus again
become necessary.
SCSI
Small Computer System Interface
The standardized input/output interface of the American National Standards
Institute (ANSI). [Standard No.: ANSI X3. 131-1986]
SCSI Device
The general name given to a device which is connected to the SCSI bus
(input/output device, I/O controller, host adapter, etc.).
SCSI ID
On the SCSI bus, this is the physical serial number which identifies a SCSI
device. This is a unique value for each SCSI device and the ID can be assigned
from #0~#7 to correspond to the bit number of the SCSI data bus.
Sense Code
This is a 1-byte code displayed in the sense data and is information which
specifies the type of error that was detected.
Sense Data
When several items of error information are included in a command's completion
GL-2 C141-E167