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quatrefoil: decorative form with four leaves or petals.
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radio latino: instrument for measuring angles in surveying and gunnery, see article on the radio latino.
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ramming rods: long rods, often in wood, intended for use in gunnery and used to push the projectile inside a cannon, or to compress the powder in an arquebus.
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reduction compass: a drafting instrument with two pivoting arms which sits parallel to a drawing surface, held up by its fixed points. The arms have no scales but can be divided at any given position by moveable points.
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Regiomontanus-type dial: design of portable altitude dial adjustable for any latitude.
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