There is only one universe in terminology of BO, but there 
may be many situations based on the usage, where we can 
classify the universes as-

1. Depending on type of data universe objects mapping

a.	Ad-hoc (personal data) – The Universe created for a 
personal usage is called Ad-hoc Universe and these are not 
shared with anybody else.
The reports created using these universes are called Ad-hoc 
Reports and generally users have the rights to store the 
reports in the Inbox. Ad-hoc reporting is a user friendly 
feature designed for all levels of users. Custom reports 
are created using queries.
b.	Non Ad-hoc (corporate data) – The universe created 
for a corporate usage is known as Non ad-hoc Universe these 
are sharable Universes and reports created from these can 
be viewed by all the users.

2. In linking universes scenario
a.	Core universe (Kernel or Master universe) – The 
Universe created and used with another universes for the 
reusability of the components.
b.	Derived universe – The Universe created using Core 
universe and there own required components.

3. Depending on universe parameters.
a.	Secured universe.
b.	Personal universe.
c.	Shared universe.