The use as a menu button dates back at least to the Sidekick II: http://en.wikip... | Hacker News

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Kevin_Marks on June 15, 2012 | parent | context | favorite | on: What the hell does ≡ do, anyway?

The use as a menu button dates back at least to the Sidekick II: http://en.wikipedia.org/wiki/File:SidekickII.jpg (though that has one long and 2 short lines).

dfox on June 15, 2012 [–]

It was used long time before that. Many TUI DOS aplications (especially Turbo Vision based or copying Turbo Vision UI style) use this character for leftmost item of menubar with "system" things and utilities like calculator (obviously inspired by Mac OS's Apple menu).

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