Source: http://www.ldonline.org/ld_indepth/glossaries/ld_glossary.html

ABA Applied Behavioral Analysis
ADA Americans with Disabilities Act
ADD Attention Deficit Disorder
ADHD Attention Deficit Hyperactivity Disorder
AHA American Hyperlexia Association
AIT Auditory Integration Training
ARI Autism Research Institute
AS Aspergers Syndrome
ASA Autism Society of America
ASD Autistic Spectrum Disorder
BBCS Bracken Basic Concept Scale
BGC Another kind of auditory training (initials of its creators)
CAN Cure Autism Now (merged with Autism Speaks)
CHA Canadian Hyperlexia Association
CST Child Study Team
CT / CAT  Computerized (Axial) Tomography Scan
DAN Defeat Autism Now
DD Developmentally Disabled
DMG Dimethylglycine
DTT Discrete Trial Training
EEG Electroencephalogram
EMR Educable Mentally Retarded
EOWPVT Expressive One Word Picture Vocabulary Test
ETS Education Testing Service
GCD Globlal Communication Disorder
GSN Gifted with Special Needs
HAILO Computer software to facilitate language learning (also FastForword)
HANDLE Holistic Approach to Neurodevelopmental Learning Experiences
HFA High Functioning Autism
KTEA Kaufman Test of Individual Achievement
IDEA Individuals with Disabilities Education Act
IEP Individualized Education Program
IFSP Individualized Family Services Plan
LD Learning Disabled/Disability/Disordered; also Language Disordered
LDA Learning Disabilities Association
LFA Low Functioning Autistic
LLD Language Learning Disorder
MAAP More Abled Autistic Persons
MMR Midly Mentally Retarded
NCC Non-Categorical Categorical
NOS Not Otherwise Specified
NT Neurologically Typical
NU Neurologically Unique
OCD Obsessive Compulsive Disorder
OT Occupational Therapy/Therapist
PDD Pervasive Developmental Disorder
PT Physical Therapy/Therapist
SELD Severe Expressive Language Delay
SNG Special Needs Gifted
SPD Semantic Pragmatic Disorder
TAG Talented and Gifted
TAPS Test of Auditory Perceptual Skills
TOLD Test of Language Development
TOWL Test of Written Language