What does Yi Yi mean?

I remember in a review at the time - either The New Yorker or the Chicago Reader - that "yI yi" (one and a two) is how (presumably Chinese) jazz groups count off the beginning of a song. It's evocative too of how Yang explores individuals and groups.

Edward Yang on the title (observer.com/2000/11/the-seventh-sense-apparently-makes-bruce-willis-a -superhero/):

The film is simply about life, portrayed across a spectrum of its span. In my view as the writer, simplicity is what’s at the bottom of the whole lot of complications at the top. Therefore, the Chinese title of the film is Yi Yi, which literally translates to "one-one," and "one-one" means "individually" in Chinese. This signifies the film’s portrayal of life through each individual member at each representing age from birth to death. "A One and a Two and a …" is what is always muttered by jazz musicians before a jam session. This is where the English title of the film came from, to signify that what’s following the title is not something tense, or heavy or stressful. Life should be like a jazzy tune.