How many cuneiform symbols were there?
It started out as 2000 symbols, but was brought down to 700, because new symbols were invented that replaced many other ones, other symbols were combined.
What kinds of symbols did sumerians use to refer to specific objects and what tool did theyuse to make the symbols?
The ancient Sumerian writing system is known as "cuneiform" from the Latin cuneus ("wedge "), because the symbols are wedge-shaped, and marked into clay tablets with a stylus. The characters of cuneiform writing were originally pictorial, but because of the method of writing, they evolved into collections of wedge-shaped marks with little visual indication to their origins.
Sumerian writing used cuneiform (Latin: "wedge-shaped") characters that had developed from pictographs. This system never developed into an alphabet while it was being used to write Sumerian, or most of the other languages that adopted cuneiform writing (e.g., Akkadian and Old Persian). However, a true alphabet of cuneiform symbols was developed by the people of Ugarit to write their language, which was related to Hebrew. (Strictly speaking, Ugaritic cuneiform employed an abjad, which is a…