Findings:

• Operating system
• Domain Operating System
• Disk Operating System
• fringe operating systems
• Linux-based operating system
• Be Operating System
• M&M's standard operating procedure for bored engineers
• real operating system
• Train Operating Company
• Guardian Operating System
• Radar operating modes
• actual operating system locales
• Toy operating systems
• Unix-like operating systems
• Operating Systems Design and Implementation
• Self-updating operating system
• "operating system" loophole in the GNU GPL
• They forgot to give me the operating system!
• Windows 95 Operating System Components
• Modern Operating Systems
• How an operating system boots
• Operating Instructions
• Net Operating Loss
• X-OS: eXtreme operating system
• The man behind the operating system
• standing but not operating
• Internetwork Operating System
• batch operating system
• International Union of Operating Engineers
• real-time operating system
• Standard Operating Procedure
• operating profit
• The perfect operating system
• Pink operating system
• Regional Bell Operating Company
• Bell Operating Company
• operating ratio
• Operating Missions as Nodes on the Internet: IP in Space
• The Operating Theater
• Operating Systems (e2poll)
• Operating Room drama
• Operating Manual for Spaceship Earth
• Windows (operating system)
• principle of maximum utility
• principle
• Principles of mathematical analysis
• Heisenberg Uncertainty Principle
• The Real principle of Maximum Utility
• Anthropic principle
• principle of utility
• Mach's Principle
• pigeonhole principle
• backward completion principle
• SNAFU Principle
• Well-ordering principle
• Pauli Exclusion Principle
• KISS Principle
• principle of non-contradiction
• The Peter Principle
• inclusion / exclusion principle
• the Nye Principle
• principle vs. principal
• It's always a pleasure to elevate a bad mood to an abstract principle
• Gallery of False Principles in Design
• T.A.Z.: Music as an Organizational Principle
• Knowledge ownership principle
• Chapter I: Purposes and Principles
• Franck-Condon principle
• The Moral Principle and the Material Interest
• Beyond the Pleasure Principle
• Security Principles
• Red Queen principle
• Hardy-Weinberg Principle
• Cooperative Principles
• principle of least action
• Heinz Uncertainty Principle
• induction principle
• Adam/Eve principle
• Adam principle
• Axe-Murderer Principle
• The dying mare principle
• Computer Graphics: Principles and Practice
• Equivalence Principle
• Cavalieri's Principle
• The principles of nuclear weapon safety and meeting girls are remarkably similar
• Eve principle
• Elementary Principles of Composition
• Principle of Causality
• Open Closed Principle
• Ten Principles Of Economics
• The Principle of Sufficient Reason
• Dittmar's Principle
• Shamanic Principles
• Principle A
• Principles of Orchestration
• Principle B
• Principle C
• principle of consent
• Stoic principles of life
• The Ten Principles of Pythagoras
• The First Principle
• nearly blinded the high school principal
• E2 Voting and the Heisenberg Uncertainty Principle
• The Planters Principle
• The Second Planters Principle
• The Anthropic Cosmological Principle
• Principles of Wiccan Belief
• Pleasure-Pain Principle
• principle of complementarity
• principle of least surprise
• The Anjan Principle
• Huygens' Principle
• Principles of War
• Idea for a Universal History with Cosmopolitan Purpose: First Principle
• Idea for a Universal History with Cosmopolitan Purpose: Second Principle
• Idea for a Universal History with Cosmopolitan Purpose: Third Principle
• Idea for a Universal History with Cosmopolitan Purpose: Fourth Principle
• Idea for a Universal History with Cosmopolitan Purpose: Fifth Principle
• Idea for a Universal History with Cosmopolitan Purpose: Sixth Principle
• Idea for a Universal History with Cosmopolitan Purpose: Seventh Principle
• Idea for a Universal History with Cosmopolitan Purpose: Eighth Principle
• Idea for a Universal History with Cosmopolitan Purpose: Ninth Principle
• Locard's Principle
• Principle of Belief Conservation
• Dirichlet's Box Principle
• The Uncertainty Principle and MPD
• The Dilbert Principle
• Fermat principle
• Weak anthropic principle
• Principles of the Portland Declaration
• The Principle of the Argument
• Kerckhoffs' Principle
• Using lists of favourites to understand the flaws of bubble sort
• Fayol's 14 Principles of Management
• Professional life: KISS and KICK principles
• Le Chatelier's Principle
• Principles require discrimination
• Reflection Principle
• The Divine Principle
• Bragg-Gray Principle
• Smaller-Thing Principle
• Four Regulative Principles
• Turing principle
• Premack principle
• Principle Study Center
• Kennard Principle
• Mass as a Principle of War
• Maintenance of the Objective as a Principle of War
• Security as a Principle of War
• Surprise as a Principle of War
• Simplicity as a Principle of War
• Entropy as a Principle of War
• Declaration of Principles
• Liskov Substitution Principle
• principles of magic
• The Lucifer Principle
• Taylor's Principles and Practice of Medical Jurisprudence
• The Principles of Leverage, or A Pedal Powered Himalayan Jaunt
• A Statement of Principle
• optimality principle
• Invariance Principle
• Yoga for Yahoos: First Principles
• Archimedes' Principle
• handicap principle
• Nutrition Guidelines: Principles of Eating Habits
• Reclaiming Principles of Unity
• Principle of Plenitude
• World Social Forum Charter of Principles
• The 90-10 principle
• the kitten principle
• Uniform Access Principle
• Strong anthropic principle
• Special and inevitable anthropic principle
• Interface Segregation Principle
• Dependency Inversion Principle
• Five Principles of Nonviolence as Outlined by Martin Luther King Jr.
• uncertainty principle
• Principle of relativity
• Competitive Exclusion Principle
• LeChatelier's principle
• Principles of adventure design
• Harm principle
• Hamilton's Principle
• Dirichlet's Drawer Principle
• precautionary principle

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