Free letter is an expression that means the total freedom to make decisions referring to a given situation.
A white card can also mean a card (playing cards, for example) in white color, without any type of printed or written content.
In a metaphorical sense, carte blanche is an oral agreement between two people, usually as a sign that there is trust between the parties involved.
the act of "give carte blanche" or "have a free hand" it means the free and absolute permission to act on a given occasion or to do something in whatever way is most convenient for the person receiving this power. In other words, it's about the full freedom to make decisions.
Example: "The captain gave carte blanche to capture the bandit" or "The owner gave the architect carte blanche to design the living room."
In English, the expression "giving carte blanche" can be translated as "to give a free hand" or "to give carte white".
The expression "free hand" it has been widely explored within the artistic field, mainly through music. The Brazilian Axé Band
Ara Ketu, the forró band magnificent and the country singer Gusttavo Lima were some of the artists who have already composed songs with this theme.See also the meanings of White color and Freedom.