Carta is Latin and Italian for "paper" and is Spanish and Portuguese "letter". In English it takes the form "card" or "chart". Most of its uses pertain to its meaning as "paper", "chart", or "map", for example in Magna Carta.

La, las are defined articles for the female gender. Un, unos are indefinite articles for male, una, unas are indefinite articles for the female gender. For example: La mesa, una mesa (female, sing), Las mesas, unas mesas (female, plural).