Vp
md80,
check if your speed booklet is not a french translation/version, because every frenchie knows that "Vp" = "vitesse propre" = true airspeed(TAS).
vitesse = speed in englisch.
propre, can have several means : clean, opposite of dirty or also "your own".
e.g." votre propre maison est propre", your own house looks clean.
enjoy your md80 = pilots plane(after 6 months on the line that is)
kind regards,
bm