alt Hacker NewsIdk, at least in Apple's case it all refers to a voice assistant and some of the features integrated with it.
If they were like MS, they would add Siri into everything and then call it "Siri Cloud", "Siri Messages", etc (if they were even more like MS, iMessage would be "Siri 365 Communication Suite")
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These are all non talky talky: Siri Suggestions, Siri Knowledge (Safari / Spotlight Intelligence), Siri Shortcuts (Automation, not voice), Siri Intelligence (On-device ML features), Siri Widget/Watch face… you get the idea. There was a time when “Siri” was the catch all for Smart/ML.
> (if they were even more like MS, iMessage would be "Siri 365 Communication Suite")
Siri 365 Communication Suite .NET Enterprise Edition With Copilot
In Microsoft's case it refers to an LLM system with some features integrated.
It also refers to various "smart" suggestions that have nothing to do with the voice assistant: https://support.apple.com/guide/iphone/turn-siri-suggestions...
Nowadays Apple would brand such features as "Apple Intelligence", but since they already existed long before, they are "Siri".
Though I agree that it's not quite as badly ubiquitous as Copilot.