Blue box

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

In collections

1 player has it in their collection.

What Wikipedia says

A blue box is an electronic device that produces tones used to generate the in-band signaling tones formerly used within the North American long-distance telephone network to send line status and called number information over voice circuits.

Excerpt from the Wikipedia article “Blue box”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Maksym Kozlenko, CC BY-SA 4.0, via Wikimedia Commons.