/DD stands for Intellectual and Developmental Disabilities.

1. Intellectual Disabilities: These involve limitations in intellectual functioning and adaptive behavior. Individuals with intellectual disabilities may have difficulties with reasoning, problem-solving, academic learning, and practical skills necessary for daily life.

2. Autism Spectrum Disorder (ASD): Autism is characterized by challenges in social communication and interaction, as well as restricted and repetitive behaviors. People with ASD often have unique strengths and challenges in areas such as communication, sensory processing, and social interaction.

3. Down Syndrome: Down syndrome is a genetic disorder caused by the presence of an extra chromosome 21. It leads to developmental delays, intellectual disabilities, and certain physical characteristics.

4. Cerebral Palsy: Cerebral palsy is a group of disorders affecting movement and muscle coordination. It is caused by brain damage or abnormalities that occur before, during, or shortly after birth.

5. Fetal Alcohol Spectrum Disorders (FASD): These are a range of conditions that can occur in individuals whose mothers drank alcohol during pregnancy. FASD can result in intellectual disabilities, developmental delays, and various physical and behavioral issues.

6. Fragile X Syndrome: Fragile X is a genetic condition that causes a range of developmental and intellectual challenges. It is more common in males and can lead to learning disabilities, social difficulties, and behavioral challenges.

7. Prader-Willi Syndrome: This genetic disorder affects various aspects of development, including intellectual functioning and behavior. Individuals with Prader-Willi syndrome often have an insatiable appetite, leading to obesity if not managed.

8. Rett Syndrome: Rett syndrome is a rare genetic disorder that primarily affects females. It leads to severe cognitive and physical impairments, as well as loss of purposeful hand skills and communication abilities.

9. Williams Syndrome: Williams syndrome is a genetic condition characterized by developmental delays, unique facial features, and a highly social and friendly personality. Individuals with Williams syndrome often have a strong affinity for music.

These are just a few examples of conditions falling under the I/DD umbrella. It's important to recognize that each individual's experience with an intellectual or developmental disability is unique. Support and interventions can vary widely based on the specific challenges and strengths of each person. Educational, therapeutic, medical, and community-based services are often used to help individuals with I/DD reach their full potential and lead fulfilling lives.