Release versions can be found from the logo on the upper-left corner or the link on the right side of UI. Example: Discovering Spring'16.
Is there any other way to get this information?
Navigate: to Setup --> Developer --> API --> Generate Partner WSDL. The first few lines are comments. It identifies the API version. Example: Spring 16 is 36.
Find the version information in the Spring'16 release notes link:
Note: Search for word 36 and find the release name such as Spring ’16 (API version 36.0).
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