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[Section 3.8](https://datatracker.ietf.org/doc/html/rfc7595#section-3.8) of Mr. 7595, Request For Comment (RFC) includes the following advice (emphasis mine):

>    Some organizations desire their own namespace for URI scheme names
   for private use (see Section 6).  In doing so, it is important to
   prevent collisions and to make it possible to identify the owner of a
   private-use scheme.  To accomplish these two goals, such
   organizations SHOULD use a prefix based on their domain name,
   expressed in reverse order.  **For example, a URI scheme name of
   com.example.mything might be used by the organization that owns the
   example.com domain name.**  Care must be taken, however, if the
   organization later loses the domain name embedded in their scheme
   names since domain name registrations are not permanent.  To
   associate the private-use scheme name with the original organization,
   the private-use scheme can be registered using the registration
   procedure in Section 7.