What does the term MISS stand for in Speak?

In Anderson's work, MISS stands for Merryweather In School
Suspension.  This is where Melinda is sent for her cutting school.  Essentially, the
room is a place where those who are not understood by school authority is sent. 
Ironically, it is where Andy is sent to, bringing back together predator and prey,
sanctioned by the school authority.  Such a reality only furthers Melinda's belief that
the school fosters alienation, particularly her own.  Additionally, the room stands for
another zone of fear.  One of the common elements of Melinda's state of being in the
world is that there is no realm in which she feels comfort, except for the art room. 
MISS enhances this feeling as it represents a domain where those who are
"mis-"understood are sent and one that brings attacker and target together.  In this
light, the room is one more realm that brings fear to Melinda, representing another
domain that is synonymous with alienation and isolation, and another obstacle for her to
overcome in her transformation. In this, the room represents an element of the world
that, at first, poses threat, but later becomes another domain that Melinda overcomes
through her strength, resiliency, and intensity.