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## E Quick reference

### A Dictionary of Weights, Measures, and Units

*Metric* As an upper-case prefix, E, see exa-, e.g. Eg = exagram.

mathematics. As E, initial

## golden number Quick reference

### A Dictionary of Weights, Measures, and Units

The number 1.618∼, unique in that its value equals the ratio of its integer part to its fractional part, i.e.

## grain Quick reference

### A Dictionary of Weights, Measures, and Units

Symbol gr. Adverting to the seed of wheat, barley, etc., the grain is a long-standing elementary unit for measuring mass,

## horse Quick reference

### A Dictionary of Weights, Measures, and Units

power. Symbol h.p. *BI 1809* 550 ft⋅lb⋅s^{-1} (745.699 872∼ W), originally the rounded estimated rate of working of a

## hounsfield unit Quick reference

### A Dictionary of Weights, Measures, and Units

[G. D. Hounsfield; UK 1919– ]

radiation physics. Symbol H. Actually a scale, providing a fine measure

## logarithm Quick reference

### A Dictionary of Weights, Measures, and Units

[Gk: λογοσ ‘ratio’]

mathematics. Symbol log. For any positive number *N*, and some reference base number b, also

## neper Quick reference

### A Dictionary of Weights, Measures, and Units

[I. Nepero = J. Napier]

engineering. Symbol Ne. A geometric scale for power ratios, akin to, and

## pi Quick reference

### A Dictionary of Weights, Measures, and Units

mathematics. Symbol π. The proportionality constant of the circle – of its circumference to its diameter and of its

## Planck length Quick reference

### A Dictionary of Weights, Measures, and Units

sub-atomic physics. Units of length, mass, and time chosen to give normalized values for the Newtonian constant of gravitation

## Q factor Quick reference

### A Dictionary of Weights, Measures, and Units

[quality factor]

electrics. Indicating overall conservational quality of an electric circuit,where *f* is frequency, *L* is inductance, *C*

## tyre size Quick reference

### A Dictionary of Weights, Measures, and Units

engineering. The modern international standard notation for car-tyre size is an interesting admixture, being an alphanumeric code involving millimetres,

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