In Spanish slang, 'cráneo' is often used to refer to someone who is very smart or intelligent. It literally translates to 'skull', but in slang, it is a compliment referring to a person's brainpower.
Examples
- Spanish: Mi compañero de clase es un cráneo en matemáticas, siempre saca las mejores notas.
- English: My classmate is a whiz in math, he always gets the best grades.