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The items used in picture writing are generally referred to as symbols. When used to create elaborate thoughts or ideas, they are called "pictograms" which means "picture message." Varying forms of writing will have different specific terminology. An example is that Egyptian picture writing symbols are called Heiroglyphs, and those present in ancient Sumarrian scrypt are called Cuneiform. Each language has its own terms for the pictures that represent words, but the fundamental definition is that they are all "pictograms" meaning, "pictures that convey a message."
There is a few inventions that are not very useful. The most known invention that is not useful is the toilet paper roller.
literary sources are more useful than archaeological sources for writing history
individuals
we have natural resources they found well useful.