The Japanese noun '七 (なな)' means 'seven'. It is used to denote the number seven in various contexts, such as counting, age, or quantity. For example: I have seven apples「りんごを七つ持っています」(りんごをななつもっています). She is seven years old「彼女は七歳です」(かのじょはななさいです). The word '七' can also be read as 'しち' in certain contexts, such as when counting in a sequence or in specific compound words, but 'なな' is more commonly used in everyday speech to avoid confusion with '一 (いち)' which sounds similar.