A thematic break.

public final class ThematicBreak: Node

From the CommonMark Spec:

4.1 Thematic breaks

A line consisting of 0-3 spaces of indentation, followed by a sequence of three or more matching -, _, or * characters, each followed optionally by any number of spaces or tabs, forms a thematic break.

Node, Visitable

public convenience init()

public func accept<T: Visitor>(visitor: T)