What is the significance of writing ‘Shubh’ and ‘Labh’ during Diwali?

The words ‘Shubh’ and ‘Labh’, meaning auspiciousness and gain, are traditionally written on doors, walls and account books during Diwali to invite good fortune and prosperity. They are believed to be Lord Ganesha’s sons, who are worshipped along with him and his wives. Their names, usually written beside a Swastika, symbolically invite Lord Ganesha and Goddess Lakshmi into the household.