CoPI – Co-principle investigator; graduate students submitting NSF dissertation improvement grants are Co-PIs.

DRDA – Division of Research Development and Administration (at UM)

IRB – Institutional Review Board (at UM)

NSF – National Science Foundation
       BCS at NSF - Behavioral and Cognitive Sciences
       SBE at NSF - Social, Behavioral, & Economic Sciences

PAC – Proposal Award Change

PAF – Proposal Approval Form

PAN – Project Award Notice (We hope!)

PI – Principal Investigator (UM faculty member)

SRO – Sponsored research office
       You must allow full SRO access or your proposal cannot be sent to NSF.

Many, many more acronyms from the UM Research web site -
http://www.research.umich.edu/aids/acronyms_glossary/acronyms.html