Prescription
There are several listed meanings for the abbreviation of PX. Some include Planet X, Post Exchange, Pixel, and Phoenix Field Office.
PX is not copyrightable. There are more than 60 trademarks including PX, however.
Pneumothorax
I think it is short hand for 'protect'. My law professor uses 'px' in her notes... example "px rights of intimacy" protect the rights of intimacy
The abbreviation px stands for "pixel". If one sees the term 100 px it is equivalent to the term 100 pixels. Most two dimensional rectangular images have a pixel size, width by height, so an image characterized as 20 px by 200 px is narrow and tall. It is 20 pixels wide and 200 pixels long.
Px I've heard it's "Dec.", "Det.", or "D.I.", but I'm not very sure.
BLR IS the abbreviation.
786 abbreviation stand for bismillah-i-rehman-e- raheem
Supt is the abbreviation for Superintendent
Cnty is the abbreviation for County.
"BBQ" is the abbreviation of "barbecue."