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radian (rad)
a unit of angle measure. One radian is the angle at the center of a circle that cuts off an arc of length equal to the radius, or 1/(2 pi) of the circle, or approximately 57.295 779°.
radiocarbon year (14C year)
a unit used in stating the nominal ages of plant or animal remains dated by radiocarbon testing. While a plant or animal is alive, the fraction of radioactive carbon in its body remains equal to the fraction in the atmosphere at that time. After a plant or animal dies, as the carbon-14 trapped in its body slowly decays, the age of the tissue can be measured by the fraction of radioactive carbon remaining. 
a traditional unit of land area in Thailand. The rai is now equal to 1600 square meters, which is 0.16 hectare or approximately 0.3954 acre. The rai is divided into 4 ngan.
an absolute temperature scale, see degree Rankine.
a temperature scale, see degree Réaumur.
an ancient Hebrew unit of weight or mass equal to 1/4 shekel,  means "quarter" in Hebrew.
register ton
a unit of cargo capacity equal to 100 cubic feet (about 2.832 cubic meters).
a Japanese unit of distance,  called the Japanese league. The ri equals 2160 ken or 12 960 shaku (the shaku is the Japanese foot). This is about 3927 meters or 2.44 statute miles.
right angle
a unit of angle measure equal to 1/4 circle, 90°, 100 grads, or pi/2 radians.
rod (rd)
a traditional unit of distance equal to 5.5 yards (16 feet 6 inches or 5.0292 meters). The rod and the furlong were the basic distance units used by the Anglo-Saxon residents of England before the Norman conquest of 1066. The Normans preferred to call it as a pole or a perch (a word of French origin, meaning a pole; see perche).  The relationship between the rod and the other English distance units was confirmed again by the Parliamentary statute of 1592, which defined the statute mile to be either 320 rods or 1760 yards, thus forcing the rod to equal exactly 5.5 yards or 16.5 feet.
an old unit of distance, another name for a rod in Dutch, but in old England and Scotland the rood was often longer than a  rod (16.5 feet), sometimes it was 20 feet, 21 feet, or even 24 feet. In South Africa, the rood was standardized to be equal to 12 Cape feet, which is 12.396 English feet or 3.7783 meters.

a traditional unit of area used to measure land. A rood is the area of a narrow strip of land one furlong (40 rods, or 660 feet) long and one rod (16.5 feet) wide, equal to 40 square rods (or perches), which equals 1210 square yards, or 10 890 square feet, or exactly 1/4 acre.
a traditional distance unit, another name for the rood.
the basic unit of time in boxing, equals to 3 minutes.
royal foot
the French pied de roi , called the Paris foot in English.
running foot
another name for a linear foot.
a traditional German unit of distance corresponding to the English rod. This could be anywhere from about 3 meters to 4.5 meters.


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