A cell is the fundamental unit of space in cellular automata, such as the Life universe. The term may either refer to the space in the grid itself (which may be dead or alive), or it may refer specifically to a square in the grid in the live state (also known as a bit or a live cell). The sense is usually clear from the context.
Patterns are commonly classified according to their cell count, which refers to the second sense: the number of specifically live cells in the pattern.
- Cell at the Life Lexicon