What is the rule of the name of the packages that start with number?

Question

The package naming convention in Android is:

com.organizationName.appName

But if the organizationName or the appName starts with a number o

Answer 1

The naming convention is merely to help you create a unique package name for the Play market. If you use your company's website address backwards (i.e. com.websitename.appname), then it's unlikely another app in the Play market will have it. You can name the package whatever you want so you can spell the number out to make it easier (com.oneOrganizationName.appName).