What is a mantle in a church?

Excuse me, could you please clarify something for me? I've been wondering, what exactly is a mantle in the context of a church? I've heard the term mentioned in sermons and religious texts, but I'm not quite sure what it signifies. Is it a symbolic garment? Or does it have a deeper spiritual meaning? I'm quite curious to understand its significance within the church and its role in religious practices. Thank you for your assistance in clarifying this matter for me.