Education, and special education in particular, is full of technical terminology and acronyms. Luckily, there are many useful glossaries available on line:

General Education

General education glossary: http://www.schoolwisepress.com/smart/dict/dict.html

Special Education

Special Education abbreviations: http://www.reedmartin.com/specialeducationabbreviations.htm

California Department of Education Special Education codes and terminology: http://dq.cde.ca.gov/dataquest/SpecEd/gls_SpecEd.htm#dis1%20–%20Glossary

San Mateo County Office of Education: http://www.smcoe.k12.ca.us/selpa/glossary.html