This is the 107th most frequent Spanish word.
ello
"It" or "that," used as a neutral pronoun referring to an idea, concept, or unspecified thing.
In this sentence, 'ello' serves as a placeholder for an idea or concept that was introduced earlier in the conversation.
Quiero que reflexionen sobre ello.
I want them to reflect on it.
This usage of 'ello' again refers to a neutral, genderless concept or idea.
Aunque no estoy de acuerdo con ello, respeto tu opinión.
Even though I don't agree with it, I respect your opinion.
Here, 'ello' is used as a neutral pronoun referring to a previously mentioned idea or situation.