virus: a software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer
code: (computer science) the symbolic arrangement of data or instructions in a computer program or the set of such instructions
ijtihad: the endeavor of a Moslem scholar to derive a rule of divine law from the Koran and Hadith without relying on the views of other scholars; by the end of the 10th century theologians decided that debate on such matters would be closed and Muslim theology and law were frozen