A symbol consists of elements from a sheet that have been stored in a symbol file. This file can then be used to load the stored elements onto other sheets, or onto the same sheet. A symbol may be a single element or a number of elements. Symbols are a powerful instrument of quickly creating a new drawing where a high degree of repetition is involved, or where extensive use is made of standard symbols such as in electrical schematics and logic diagrams. The availability of standard symbol libraries considerably reduces the work required to create such a drawing and also ensures a uniform drawing standard.