# Number+to+be+divided

81

**Collar number**— A collar number, also known as a shoulder number, Force Identification Number (FIN) or occasionally as Force Number (although this can also refer to ID number of a force itself), identifies uniformed officers, Police Community Support Officers… …82

**Tetrahedral number**— A pyramid with side length 5 contains 35 spheres. Each layer represents one of the first five triangular numbers. A tetrahedral number, or triangular pyramidal number, is a figurate number that represents a pyramid with a triangular base and… …83

**Magnetic Reynolds number**— The Magnetic Reynolds number is a dimensionless group that occurs in magnetohydrodynamics. It gives an estimate of the effects of magnetic advection to magnetic diffusion, and is typically defined by: where U is a typical velocity scale of the… …84

**Biot number**— The Biot number (Bi) is a dimensionless number used in unsteady state (or transient) heat transfer calculations. It is named after the French physicist Jean Baptiste Biot (1774 1862), and relates the heat transfer resistance inside and at the… …85

**Small number**— Within a set of positive numbers, a number is small if it is close to zero. A number is smaller if it is less than another number.Within a set of positive and negative numbers there is ambiguity, because being closer to zero does not correspond… …86

**50 (number)**— This article discusses the number fifty. For the year 50 CE, see 50. For other uses of 50, see 50 (disambiguation) ← 49 51 → 50 ← 50 …87

**85 (number)**— 85 (eighty five) is the natural number following 84 and preceding 86. ← 84 86 → 85 ← 80 …88

**Centered square number**— In elementary number theory, a centered square number is a centered figurate number that gives the number of dots in a square with a dot in the center and all other dots surrounding the center dot in successive square layers. That is, each… …89

**prime number theorem**— Math. the theorem that the number of prime numbers less than or equal to a given number is approximately equal to the given number divided by its natural logarithm. [1660 70] * * * ▪ mathematics formula that gives an approximate value for the… …90

**Vehicle Identification Number**— VIN redirects here. For other uses, see Vin (disambiguation). VINs redirects here. For the non profit organization, see VINS. For the Russian Baptist pastor, see Vins. VIN on a Chinese moped A Vehicle Identification Number, commonly abbreviated… …