Algebra: the symbols are "+", "×", "x", "y", "1", "2", "3", etc.
operating system | Super Nintendo Entertainment System | Nintendo Entertainment System | Android (operating system) | Global Positioning System | American Physical Society | Solar System | X Window System | Physical medicine and rehabilitation | Korean Broadcasting System | System of a Down | Domain Name System | Physical therapy | Physical fitness | Physical Education | Seoul Broadcasting System | physical education | North Carolina Community College System | Mutual Broadcasting System | Bulletin board system | system | Turner Broadcasting System | symbol | Program and System Information Protocol | Geographic information system | Ubuntu (operating system) | Tokyo Broadcasting System | Federal Reserve System | Youth system | Embedded system |
The approach is based on the assumption that many aspects of intelligence can be achieved by the manipulation of symbols, an assumption defined as the "physical symbol systems hypothesis" by Allen Newell and Herbert A. Simon in the middle 1960s.