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Wiktionary
blinkenlights

n. (context computing slang English) The flashing lights on an electronic device such as a modem, router or network hub (originally the front-panel lights on old computers).

Wikipedia
Blinkenlights

Blinkenlights is a hacker's neologism for diagnostic lights usually on the front panels on old mainframe computers, minicomputers, many early microcomputers, and modern network hardware.

Blinkenlights (disambiguation)

Blinkenlights may refer to:

  • Blinkenlights, a joke hacker term
  • Project Blinkenlights
  • Blinkenlights Archaeological Institute

Usage examples of "blinkenlights".

The LEDs (Das Blinkenlights, as they are called in the Be community) flash merrily next to my right elbow as I hit the keys.

Some German hackers have even come up with a Das Blinkenlights replacement: it's a circuit board kit that you can plug into PC-compatible machines running BeOS.