(1) (Stream EDitor) A Unix text editor that processes an entire file. It is the stream-oriented version of ed, an earlier text editor. Sed executes ed commands, but instead of editing one line at a time, sed applies the commands to the whole file.

(2) (SED) (Surface-Conduction Electron-Emitter Display) A thin CRT technology developed by Canon and Toshiba that is based on field emission technology (FED). Announced in 2002, SED TVs only a few centimeters thick are expected in 2010.

Using millions of low voltage surface-conduction electron-emitters (one for each pixel) on the cathode plate and regular CRT-like phosphors on the glass anode plate, the SED display uses a third of the power of plasma displays. SED prototypes at the 2006 Consumer Electronics Show in Las Vegas demonstrated remarkable clarity; however, LCD and plasma technologies are also improving. Due to legalities over sharing licensed technology relating to carbon nanotube emitters, Canon announced in early 2007 that it would buy out Toshiba's stake in the SED venture. See FED and plasma display.