What does PG-13 stand for?

Parental Guidance suggested if under 13 years of age (movie rating)

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Proving Ground Public Guardian Pure Garbage Pwllgwyngyll (Wales) Pyoderma Gangrenosum (skin disorder) Spratly Islands Promoting Group of the Movement for a Better World Plant Genetics & Biotechnology Pacific Gas and Electric Company Purchased Goods and Services		Periodically Gapped-Data Amplitude and Phase EStimation (algorithm) Periodically-Gapped Discrete Fourier Transform Prostaglandin Glycerol Esters and Prostaglandin Ethanolamide Projective Geometry Low-Density Parity-Check (coding) Provisional Government - Republic of New Afrika Postgraduate Diploma Path-Gain/Delay-Spread Propagation Model Product Generation Segment Panzer General 1 På Grund Af (Danish: Because Of)