Signless Meditation • 8th Jhana
As explained in many suttas, for example in MN121, in the gradual training approach the signless concentration is the next step after &quot;neither perception nor nonperception&quot; and the last step before The Final Liberating Realization.
If you search this site for the words signlessness, signless, nimitta, animitta, and semiotics - you will find many of my detailed answers on these topics.
For a detailed analysis of Pali sources, see this nice article: &quot;Signless&quot; Meditations in Pali Buddhism.
This topic is of the utmost importance because it connects the Early Buddhism and Mahayana into one teaching.