The logo that was used for iOS 5 and 6. The microphone glows purple depending on the volume a person is speaking at.
The logo that was used for iOS 7 and 8. The style became simplified and removed all colors, only using white and gray. This logo is for now is still seen in Assistive Touch in iOS 9, 10, and 11.0.x, but in iOS 11.1 it will be replaced by the current Siri logo.
The logo that was used for iOS 9.
The outer ring removed and now has a purple gradient background.
The logo that was used for iOS 10.
The microphone was removed and replaced with audio waves, similar to the ones found when using Siri since iOS 9.
The logo that is used for iOS 11. The waves were removed and was replaced with a bubble using the same colors.
This logo is used in macOS Sierra. A circular version of the one used in iOS 10.
The logo that is used for macOS High Sierra. Same as iOS 11, but in macOS's signature circle icon.
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