# Oc

**Occams Razor**- The suggestion that the simpler a theory is, the better it is.
**Occultation**- Interruption of the light from an object to an observer when a body in interposed.
**Occupational Safety & Health Administration**- Congress created the Occupational Safety and Health Administration (OSHA) to assure safe and healthful working conditions for working men and women by setting and enforcing standards and by providing training, outreach, education and assistance.
**Occupied Bandwidth**- The frequency bandwidth such that, below its lower and above its upper frequency limits, the mean powers radiated are each equal to 0.5% of the total mean power radiated by a given emission.
**Ocean Conveyor Belt**- The theoretical route by which water circulates around the entire global ocean, driven by wind and the thermohaline circulation.
**Octadecagon**- An 18 sided polygon.
**Octadecanoic Acid**- Alternative name for Magnesium Stearate.
**Octagon**- A polygon with 8 sides.
**Octahedral Position**- The void space among closed-packed, hard sphere atoms or ions for which there are six nearest neighbours.
**Octahedron**- A polyhedron with 8 faces.
**Octal**- A number system using the base-8, i.e., each digit can be any of 8 values,
represented by the digits 0-7.
**Octane**- Flammable liquid compounds found in petroleum and natural gas.
**Octane Number**- A rating of the 'knock' characteristics of motor fuels.
**Octant**- Any one of the 8 portions of space determined by the 3 coordinate planes.
**Octave**- Two frequencies are an octave apart if the ratio of the higher frequency to the lower frequency is two.
**Octave Band**- A segment of the frequency spectrum separated by an octave.
**Octave Band Level**- The integrated sound pressure level of only those components in a specified octave band.
**Octet**- A set of eight valence electrons.
**Octet Rule**- A guideline for building Lewis structures that states that atoms tend to gain, lose, or share valence electrons with other atoms in a molecule until they hold or share eight valence electrons.
**Octillion**- A number equal to 10
^{27}. **Ocular**- Pertaining to or in relation with the eye.
**Oculogyric**- Referring to movements of the eyes.
**OCV**- Abbreviation of Open Circuit Voltage.