CellEpilog
is an option for Cell which gives an expression to evaluate after each ordinary evaluation of the contents of the cell.
Details

- CellEpilog is evaluated for all ordinary kernel evaluations, as initiated for example by
or by Evaluate in Place.
- It is not evaluated for evaluations associated with Dynamic objects.
- The default setting is CellEpilog->None.
Examples
Wolfram Research (2007), CellEpilog, Wolfram Language function, https://reference.wolfram.com/language/ref/CellEpilog.html.
Text
Wolfram Research (2007), CellEpilog, Wolfram Language function, https://reference.wolfram.com/language/ref/CellEpilog.html.
CMS
Wolfram Language. 2007. "CellEpilog." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/CellEpilog.html.
APA
Wolfram Language. (2007). CellEpilog. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/CellEpilog.html