Zhian'tara

Zhian'tara is a Trill ceremony that temporarily transfers the minds of previous Trill symbiont hosts into friends of the symbiont's current host. Each individual friend embodies an individual host's personality, for a limited amount of time, while the ceremony is in progress. This allows the current host to learn about their predecessors.

References

• The Star Trek Encyclopedia (Updated and Expanded Edition) (1999)