The Sydney line means that the line extends from one side to another side. It runs across the palm. It is similar to the simian line. The difference between these two kinds of a line is that the heart line still exists on the palm of the Sydney line. If the Sydney line exists on the hand of the child, it represents that the owner is very active. However, if it happens in the hands of the adult, it implies that the owner is very introverted. His or her thought is complicated. He or she has a strong personality. Sometimes, they will be oversensitive.