श्री भगवानुवाच पश्य मे पार्थ रूपाणि शतशोऽथ सहस्रशः। नानाविधानि दिव्यानि नानावर्णाकृतीनि च ॥

paśhya me pārtha rūpāṇi śhataśho ’tha sahasraśhaḥ nānā-vidhāni divyāni nānā-varṇākṛitīni cha

Behold, O Pârtha, a Form of Me, a hundredfold, a thousandfold, various in kind, divine, various in colours and shapes.

In plain words: Krishna tells Arjuna (Partha) to look at his divine forms. There are hundreds and thousands of them, in many kinds, colors and shapes.