Yes
Symbian OS
Android is an open source platform for mobile phones. It is developed by Google and is installed on over 1 billion devices. It is currently the worlds most popular mobile operating system.
Android does not stand for anything Android simply means robot
In brief you can say Android is a open source operating system which is designed by Andy Rubin and his team to power low powered devices like smartphones later Android OS was acquired by Google Inc. and you the user of Android is not only limited to Smartphones rather than they are being used to power satellites, Refrigerators, cars, oven and anything you can think of !
Ubuntu is an operating system and it is an open source software. This software could be installed on many devices including laptops, smartphones and tablets.
Proprietary operating systems are commercial operating systems designed to run on specific computer hardware for which they are licensed. Other operating systems such as Linux and OpenBSD are free and open source and can be used on any hardware on which someone can make it work. The Android operating system is a Google implementation of Linux designed to work on smart phones and tablets.
A vessel capable of operating or remaining under water. Source: Answers.com
OS is an open-source operating system
Android is a mobile operating system based on the Android Open Source Project (AOSP), which is a project run by Google. It is used to power smartphones, tablets, and other mobile devices.
LINUX and Unix OS is open-source operating system.....! but Windows version OS is not the open-source operating system....!
You can get the source code to Cosmos itself from the project's page at Codeplex, in the related links section. Cosmos is designed to allow people to develop their own operating systems. Those who do so may, or may not, opt to make their source code public. You'd need to contact them directly to see if the source is available.
Linux is the example of the latest open source operating system.