What does the longer line in a cell symbol denote?

In the standard symbol of an electric cell, the longer line represents the positive terminal (+).

This convention is used in circuit diagrams to clearly indicate the polarity of the cell, which is essential for proper circuit connections and current direction.

The shorter line represents the negative terminal (−). Current in the external circuit flows from the positive terminal to the negative terminal, making this distinction important for analyzing and constructing circuits accurately.