Pratyabhijna=Prati+abhijna.
abhijna is direct perception; prati is to be reminded of what was already known.
“This is an elephant” is direct perception.
“This is that elephant” is pratyabhijna.
In technical works, pratyabhijna is used for realising the ever-present Reality and recognising it.
(void or blank), ati sunya (beyond sunya) and mahasunya (immense void), all mean the same, i.e., the Real Being only.