Learn Spanish (Latin America): Es un giro único, o sea, muy diferente. - It is a unique turn, in other words, very different.

When único is placed after the noun, as in un giro único, it describes the quality of being 'unique' or 'one of a kind.' If it were placed before the noun, like un único giro, the meaning changes to 'only' or 'single' (meaning exactly one turn).

What does giro mean in this context?

While giro can literally mean a physical turn or spin, it is very commonly used figuratively to mean a 'twist' or 'shift' in a situation, like a plot twist in a movie or a change in a project's direction.

What is the phrase o sea and how is it used here?

O sea is a very common conversational connector. It is used to mean 'in other words,' 'that is to say,' or 'I mean.' It is used here to clarify and expand on what the speaker meant by a 'unique turn.'

Why isn't there a word for 'It' at the start of the sentence before Es?

In Spanish, subject pronouns are usually dropped when the context makes it clear. The verb form Es already carries the meaning 'It is' in this context, so forcing a subject pronoun into the sentence is unnecessary.