OS:  Unix / Linux

Often called the “Super User” command. The su (short for substitute user) command makes it possible to change a login session’s owner without the owner having to first log out of that session.

Although su can be used to change the ownership of a session to any user, it is most commonly used to change the ownership from an ordinary user to the root (i.e., administrative) user, thereby providing access to all parts of and all commands on the computer or system.

And like that of Goku from Dragon Ball Z you elevate yourself to be a powerful user.

Usage example:

sysadmin@jermsmit:~$ su
Password:
root@jermsmit:/home/sysadmin#