A hierarchical diagram illustrating the layers of computer systems from physics to application software.The initial stage is depicted by physics with a flower symbol. Above it is Devices, depicted with a transistor symbol. Next is Analog Circuits, shown with an operational amplifier symbol. Digital Circuits follow, represented by a logic gate symbol. Logic is next, illustrated with a plus sign and lines. Micro-architecture is depicted with arrows and blocks. Architecture is represented by three horizontal bars. Operating Systems are shown with a laptop icon. At the top is Application Software, represented by the text '>"hello world!"'.Pipelined Core