This is the 3997th most frequent Portuguese word.
lo
In Portuguese, "lo" is not a standalone word; it may appear as part of pronoun contractions (e.g., "vê-lo" meaning "see him/it").
In this sentence, 'o' is a direct object pronoun referring to a male person in the third-person singular.
Eu o encontrei no parque.
I found him in the park.
Here, 'O' serves as a definite article used before a masculine singular noun.
O livro que você mencionou é interessante.
The book that you mentioned is interesting.
In this instance, 'lo' is an accusative pronoun attached to the verb 'ajudar', referring to a male person or entity in the third person.