9.2 Join
Stroke always follows a path, and a path can have sharp turns, called cusps. Typically, a cusp is a nonsmooth node (12.5.5 Node Types) where two path segments join, but you don’t even need to have a node to make a cusp; it is possible to create a sharp cusp in the middle of a Bézier curve (13.1.7 Spiro Spline).
The way the stroke behaves at the cusps is determined by the two style properties: join type and miter limit. They are editable by the Stroke style tab of the Fill and Stroke dialog, right below the stroke width control. The three possible join types, represented by the three toggle buttons, are Miter join (default), Round join, and Bevel join:
Miter join
In this join, the outer outline of the stroke at the cusp point is continued ...
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