It is distinguished from:
' Subduction initiation (SI) '
is the initiation of subduction (i.e., the sinking of oceanic plates into the mantle) in the absence of pre-existing subduction zones anywhere else on the planet.
While SZI describes the initiation of a feature (i.e., a subduction zone), SI describes the initiation of a process (i.e., subduction). As such, SZI and SI are describing two strongly different aspects of the ocean-plate tectonics, and must therefore be clearly distinguished from each other.
For more information, a universal glossary, and an online discussion forum, go to SZIdatabase.org.