What else would it be? Fact, conjecture, a hypothetical that you don't currently believe, someone else's opinion, something you read on a bill board, demon poss

What else would it be? Fact, conjecture, a hypothetical that you don't currently believe, someone else's opinion, something you read on a bill board, demon possession, a marketing message, something you read in a book, something you learned via a diving method such as reading tea leaves... The list is actually quite long. I say "I believe" if I don't have any facts to back it up, I don't say "I believe" If I do.