Patanjali's yoga sutras

These three practices of concentration (dharana), meditation (dhyana), and samadhi are more intimate or internal than the previous five practices.
(trayam antar angam purvebhyah)

trayam = these three

antar = more internal, inner, intimate

angam = rungs, limbs, accessories, components, steps, parts, members, constituents

purvebhyah = preceding, previous