This is the very first Play Books logo when Google Play launched.
To coincide with Android Lollipop 5.0's release, all Google Play apps received a new icon.
An SVG version of this logo is recommended but not required.
You can help Logopedia by uploading it here.
To coincide with the release of Android Nougat 7.0, the services on the Google Play banner received a Play button-like icon.