11. Cartography studies the representation of the Earth's surface with abstract symbols ( map making ). 12. Using abstract symbols , the artists explored their spirituality and the connection between mysticism and science. 13. These programs simulated intelligence using logic and high-level abstract symbols ( an approach called Good old-fashioned AI ). 14. In some cases these deities are directly associated with these experiences; in others they are more abstract symbols . 15. This theory was disputed by Muhammad Abdul Nayeem, who believes that they are simply abstract symbols or tribal marks. 16. This theory was disputed by archaeologist Muhammad Abdul Nayeem, who believes that they are abstract symbols or tribal marks. 17. He speaks of the final destination that is the absolute principle of being, variously representing it through abstract symbols . 18. The engravings show depictions of a wide range of topics including agricultural and war scenes alongside more abstract symbols . 19. Tiro's system consisted of about 4, 000 abstract symbols that were extended in classical times to 5, 000 signs. 20. By the 1980s, researchers had come to accept that chimpanzees can learn abstract symbols and combine them to form sentences.
