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A half-line from each start point, through a second point, extended infinitely.

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• Start (point): the point the ray shoots out from.
• Through (point): the point the ray aims through before extending infinitely.

• Ray (curve): the half-line from the start through the second point.

A half-line: it starts at a point, passes through a second, and carries on forever that way. Mostly used as scaffolding, something for other geometry to meet or be measured against.

A ray is infinite, so it is not a shape you can fill or thicken. It will not bound a region, and nodes like Fillet and Offset have nothing to bite on. Give one point and a list on the other socket and you get a fan of rays, one per point.

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• In the modeling view: Ray - draw the same ray directly on the canvas.