CC Madhya 24.155
eka eka tina bhede chaya vibheda
“The two types of ātmārāma-yogīs are called sagarbha and nigarbha. Each of these is divided into three; therefore there are six types of worshipers of the Supersoul.
The word sagarbha-yogī refers to a yogī who worships the Supersoul in the Viṣṇu form. The nigarbha-yogī worships the Supersoul without form. The sagarbha and nigarbha yogīs are further categorized: (1) sagarbha-yogārurukṣu, (2) nigarbha-yogārurukṣu, (3) sagarbha-yogārūḍha, (4) nigarbha-yogārūḍha, (5) sagarbha-prāpta-siddhi and (6) nigarbha-prāpta-siddhi.