Thus the image underlying nibbana is one of freedom. The Pali commentaries support this point by tracing the word nibbana to its verbal root, which means "unbinding." What kind of unbinding? The texts describe two levels. One is the unbinding in this lifetime, symbolized by a fire that has gone out but whose embers are still warm. This stands for the enlightened arahant, who is conscious of sights and sounds, sensitive to pleasure and pain, but freed from passion, aversion, and delusion. The second level of unbinding, symbolized by a fire so totally out that its embers have grown cold, is what the arahant experiences after this life. All input from the senses cools away and he/she is totally freed from even the subtlest stresses and limitations of existence in space and time.
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https://www.accesstoinsight.org/lib/authors/thanissaro/nibbana.html