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

You know, it only costs like $5 to register a new domain name. Just register oneorganizationName.com and use that. You know it will be unique, you know it will be a valid package name, and now you know that phishers and spoofers won't be registering oneorganizationName.com for themselves to trick your customers.