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2008 song about the Apple key by Hot Lava: https://www.youtube.com/watch?v=ts3tLs6xB1U

Also Alt-J, whose logo Δ can be obtained by pressing alt+j on a Mac:

https://en.wikipedia.org/wiki/Alt-J

looking at the mac keyboard im typing on, there is no key called "alt". There is one called option, and pressing opt+k gives me ∆.

Wonder why that changed? (or if it did?)

Alt/Opt/⌥ label also depends on age/region/etc, as outlined in the blog post. You can see an example of a key with "Alt" in the second image of the post.

Personally, I'm particularly fond of the "electronic switch" glyph ⌥ used to denote Option, which I first saw in the manual for classic Macintosh app: UltraPaint, 1990 by Deneba Systems, so dated around the beginning of Unicode.

My early aluminium Apple A1243 2171 Wired Keyboard, British layout dated 2007, has it labelled with both Alt and ⌥. (BTW my keyboard is still going strong at 18 years old with only the shift key replaced after I wore it completely through.)

Interesting. Wonder why its also shifted to opt/alt + k instead of j

Alt+J on my British layout gives ∆ so another regional thing. The band are British, so it figures.

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