OSD, abbreviation for on-screen display, It is a menu on several devices that provides options used to adjust the display or other options available to that specific device. OSD can also be a short form for open source definition, is an agreement for distributing, using, and modifying open source code.
OSD can be summarised as object-based storage device, an OSD is a device that utilizes the standard of storing data sets as objects. The SCSI (small computer system interface) command set for OSDs was created by the Storage Industry Networking Association.
The picture shown is an example of an OSD button being displayed in the bottom right corner of a computer monitor.