maverick

An unbranded range animal.

(by extension) Anything dishonestly obtained.

(by extension) One who is unconventional or does not abide by rules.

(by extension) One who creates or uses controversial or unconventional ideas or practices.

A person in the military who became an officer by going to college while on active duty as an enlisted person.

A queen and a jack as a starting hand in Texas hold 'em.

To take an unbranded range animal.

(by extension) To seize without a legal claim.

Of cattle: unbranded.

Showing independence in thoughts or actions.

“He made a maverick decision.  She is such a maverick person.”