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a historic unit of distance between two successive falls of person's same foot,  equals two steps. The Romans counted 1000 paces in a mile with each pace being a little over 58 inches (or about 148 centimeters). The pace is usually defined to be exactly 5 feet (or 152.4 centimeters); this unit is also called the great pace or geometrical pace.

However,  "pace" is often used as an alternate name for the step in military use.
a commercial unit specifying the number of items per package.
a traditional Russian unit of weight equal to 1200 funte, 30 pudi, 1083 pounds, or 491.4 kilograms.
a unit of information or data in computer science, usually equal to 256 bytes. a single byte can store the address of a location within a page.
a unit of quantity equal to 2. The word is from the Latin paria , meaning "equals." Originally a pair was simply a group of similar objects.  Now it refers to a group of two.
Historic unit of distance, there are two versions of palms: Shorter palm equals to the width of a person's palm. It equals 4 digits or 1/6 cubit,  about 3 inches or 7.5 centimeters. Longer palm equals to the length of a person's hand, from the wrist to the end of the middle finger. In the English system this unit is equal to 9 inches (22.86 centimeters) and is usually called a span. In Roman times, the longer unit was known as the palmus major and the shorter one as the palmus minor. In the nineteenth century, the 3-inch version was more common in Britain,  and the 9-inch version was more common in the U.S.

palm  sometimes used in Dutch for the decimeter (10 centimeters, or about 3.937 inches).
a traditional unit of distance in Spain and Portugal. It is about 20.9 centimeters in Spain and a little more than that in Spanish Latin America.This unit was based on the width of a person's outstretched hand, from the tip of the thumb to the tip of the little finger, a definition identical to that of the English span.
a historic unit of distance. The unit originated in Persia but was used throughout the ancient Middle East and Mediterranean. It was equal to roughly 3.5-4.0 miles or about 6 kilometers. In Arabic the unit is called the farasang.
Paris point
a unit of length equal to 2/3 centimeter (0.59 inch) used to measure shoe size in  European countries.
pascal (Pa)
the SI unit of pressure. The pascal is the standard pressure unit in the MKS metric system, equal to "one newton per square meter" or one "kilogram per meter per second per second." Air pressure is also measured in hectopascals (hPa), with 1 hPa = 1 millibar. The unit is named for Blaise Pascal (1623-1662), French philosopher and mathematician, who was the first person to use a barometer to measure differences in altitude.
the traditional Portuguese foot, equal to 12 polegadas or about 33.324 centimeters or 13.12 inches.
pearl grain
a unit of mass equal to 1/4 carat or 50 milligrams; see grain.
a traditional unit of volume, formerly used for both liquids and solids, mostly for dry commodities such as grains, berries, and fruits. A peck is 2 gallons, 8 quarts, or 1/4 bushel.  In the U. S., a peck holds 537.605 cubic inches or approximately 8.8098 liters. In the British imperial system, a peck is a little larger, holding 554.84 cubic inches or approximately 9.0923 liters. The word "peck", comes from the name of a similar old French unit.
pencil hardness
a traditional measure of the hardness of the "leads"  in pencils. The hardness scale, from softer to harder. In the U.S., many manufacturers use a numerical scale in which the grades B, HB, F, H, 2H correspond approximately to numbers 1, 2, 2-1/2, 3, and 4, respectively. This hardness scale is analogous to the well-known Mohs hardness scale used in geology to measure the hardness of minerals.
pennyweight (dwt or pwt)
a unit of weight in the traditional troy system, equal to 24 grains or 1/20 troy ounce. One pennyweight is about 1.5552 gram. The d in the traditional symbol dwt is from the Latin word denarius for the small coin which was the Roman equivalent of a penny.
a unit of quantity equal to 5.
per annum (PA)
a traditional unit of frequency equal to once a year.
a unit of proportion, equal to 0.01. The word is Latin, meaning "by the hundred."  The symbol % can be placed after any number; mathematically, its effect is an immediate division by 100.
a unit used in statistics to describe a portion of the individuals or events being studied. Suppose the data are arranged by numerical scores, from highest to lowest. A score belongs to the 78th percentile, for example, if it is greater than 78% of the scores but it is not greater than 79% of the scores. This procedure divides the scores into 100 percentiles, numbered 0th through 99th.
an alternate name for the rod (16.5 feet or 5.0292 meters). The word perch comes from the Latin pertica (pole).
The Romans also had a distance unit called the pertica, but it was shorter: 10 Roman feet (9.71 English feet or 2.96 meters).
French "perche" equals 18 pieds or 3 toises. By legal definition in Canada it equals 19.1835 English feet or 5.847 13 meters.
Ireland standardized perch at 21 English feet (6.4008 meters) or 14/11 English perch or rod

perch is also a unit of area equal to one square perch (length). A perch of area covers exactly 272.25 square feet or about 25.292 85 square meters. There are 40 perches in a rood and 160 perches in an acre.
a metric prefix denoting 1015 (one U.S. quadrillion). The prefix was chosen to suggest the Greek penta
a traditional German weight unit corresponding to the English pound . The pfund is equal to 16 unze or 32 lot.  The various German states adopted different standards, ranging from  the English pound (454 grams) to the Viennese pfund at about 1.2 pounds (560 grams). In the late nineteenth century, the pfund was redefined as a metric unit equal to exactly 500 grams (about 1.102 31 pound).
a metric prefix denoting 10-12 (trillionth). It is coined from the Italian piccolo, small.
a unit of weight widely used in East Asia during the colonial period. The picul is equal to 100 catties, about 133.3 pounds or 60.5 kilograms. A metric unit equal to 60 kilograms (132.28 pounds) in Thailand.
the traditional foot of Spain, equals 1/3 vara or 12 pulgadas, about 27.86 centimeters or 10.97 inches; the pie is generally longer in the Latin America . The Argentine pie is 28.89 centimeters or 11.37 inches.
a unit of quantity, equal to 1, represents an exact count of items.
the traditional French foot, called the Paris foot in English. It equals about 32.48 centimeters or 12.79 inches; the official Canadian definition is 12.789 inches (32.484 06 centimeters), In French Canada, pied is generally used to refer to the English foot.
the traditional Italian foot, one common length was about 29.8 centimeters.
pik or pic
a traditional unit of distance in the Eastern Mediterranean and Near East. A typical value is about 28 inches (71 centimeters). This is an "arm" unit, like the Italian braccio and the Russian arshin.
a traditional British unit of volume for beer. It is equal to 1/8 barrel or 4.5 imperial gallons (20.457 liters).
a traditional unit of area in Taiwan(China), equal to about 3.305 square meters (3.953 square yards). The same unit  in Korea as the pyong.
a traditional unit of volume equal to 1/2 quart. There are three different pints: the U. S. liquid pint, equal to exactly 28.875 cubic inches, 16 fluid ounces, or approximately 473.176 milliliters;  the U. S. dry pint, equal to 33.600 cubic inches or approximately 550.611 milliliters; the British Imperial pint, equal to 20 British fluid ounces, 34.678 cubic inches or approximately 568.261 milliliters.
a traditional Portuguese unit of liquid volume, similar in size to the English pipe The pipa equals to 500 liters, which is 0.5 cubic meter, 132.085 U.S. gallons, or 109.996 British imperial gallons.
a traditional unit of liquid volume. a pipe equals 126 U.S.gallons, about 16.844 cubic feet or 476.96 liters In the U.S..
a unit used in printing, means "characters per inch" .
a picture element. Pixels are often used to measure the resolution (or sharpness) of images.
a unit of proportion, equal to 0.01 or 1%, often called a percentage point.

a unit of quantity equal to 1. This unit is used to express changes in an arbitrary score or index.
the Dutch pound, historically about 494 grams (1.089 English pounds).
the French "inch" unit, equal to 1/12 pied.
a traditional unit of mass or weight. The unit now in general use in the United States is the avoirdupois pound,  is divided into 16 ounces. By international agreement, one avoirdupois pound is equal to exactly 453.592 37 grams; this is exactly 175/144 = 1.215 28 troy pounds.

The troy pound, named for the French market town of Troyes, was the unit used in England by apothecaries and jewelers, is divided into 12 ounces like the Roman pound. One troy pound is 373.242 grams, or  0.822 858  avoirdupois pounds (13.165 avoirdupois ounces). The troy and avoirdupois pounds are connected by the grain:  5760 grains in a troy pound and 7000 grains in an avoirdupois pound.
the ancient Greek foot, a unit of distance equal to about 30.7 centimeters, a little longer than the modern English foot. The plural is podes
the Spanish inch, equal to 1/12 pie. It varies from about 23.2 to 24.1 millimeters (0.913 to 0.949 inch).
a Korean unit of area equal to about 3.306 square meters or 3.954 square yards. The pyong is widely used in Korea to measure areas both inside and outside buildings.


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