Arrow of time

The phrase Arrow of time is used to denote a direction that time is progressing in. Things do not seem to ever go backwards. Things do not unbreak. We do no get younger. The concept of entropy seems to follow an arrow of time to a more random state of affairs in most situations.

http://en.wikipedia.org/wiki/Arrow_of_time

Within the Physics of subatomic particles things get more complex.

Successional itopaths, progressional itopaths, regressional itopaths, digressional itopaths, and extensional itopaths have a sense of the arrow of time.

See also:

Sectional production concept, Prograde, Retrograde, Prograde time, Retrograde time, Actual time, Apparent time, External observer time, Real time, Prograde sectional production concept, Retrograde sectional production concept, Actual prograde sectional time, Apparent prograde sectional time, Actual retrograde sectional time, Apparent retrograde sectional time,