How to abbreviate Pen Down?

The ways to abbreviate Pen Down.

Stands For|0Abbreviated As|1Related|0
4
PD:
Pen Down
11 months ago|3.3k views|share |citing 
APASmart Define. (2016). Pen Down. Retrieved May 26, 2017, from http://smartdefine.org/pen_down/abbreviations/a
ChicagoSmart Define. 2016. "Pen Down" http://smartdefine.org/pen_down/abbreviations/a (accessed May 26, 2017).
HarvardSmart Define 2016, Pen Down, Smart Define, viewed 26 May, 2017, <http://smartdefine.org/pen_down/abbreviations/a>.
MLASmart Define. "Pen Down" 8 June 2016. Web. 26 May 2017. <http://smartdefine.org/pen_down/abbreviations/a>