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trayam-ekatra saṃyamaḥ

The three in the same place is complete restraint

traya - the three

ekatra - in the same place

saṃyama - complete restraint

Commentary by T Krishnamacharya:

The evolution of Samādhi is Sthūla Savitarkā to Sthūla Nirvitarkā. This is Viniyoga Krama, then Sūkṣma Savicārā to Sūkṣma Nirvicārā. Commentary to Yoga Sūtra Chapter Three verse 4 Cross referencing to Yoga Sūtra Chapter One verse 42-44.