I.E.P. stands for Individualized Education Program or Individualized Education Plan. An IEP is the written plan for the provision of special education support and services for students with disabilities and who are gifted. Under the federal law, IDEA (Individuals with Disabilities Education Act), students who qualify under one of Pennsylvania's 13 categories are entitled to an education that meets their unique needs and provides access to the general education curriculum. 
To learn more about IEPs, check out the following articles. If you have any questions about your child's IEP or about special education, please contact me via email.
What is an IEP? An Overview for Teachers and Parents by Jill Staake
IEPs and 504 Service Agreements from the Pennsylvania Department of Education