(Philippines) Initialism of Philippine Development Plan.

Initialism of personality disorder not otherwise specified.

Initialism of probability density function. / Alternative letter-case form of PDF (“Portable Document Format”)

plural of PDO

(oceanography) Abbreviation of Pacific decadal oscillation. / (software) Initialism of Persistent Data Object (data object not lost when the application exits)

plural of pdf

Abbreviation of phthioceroldimycocerosate.

(in street addresses) Abbreviation of parade.

plural of PDE

(rail transport) Initialism of passenger dedicated line. / (computing) Initialism of pushdown list. / (computing) Initialism of page description language.