Pervasive Developmental Disorder: Commonly called PDD or atypical autism, this type of autism is generally given to children who have autistic symptoms but do not fit well within the other categories.

Panna cotta makes an excellent and atypical dessert.

Inherited conditions include too many or too few teeth, too much or too little space between teeth, irregular mouth and jaw size and shape, and atypical formations of the jaws and face, such as a cleft palate.

Couture designers favor luxurious embellishments that are slightly atypical, including oversized rosettes, wide ruffles, tulle, bows and various types of crystals and rhinestones.

The American Psychiatric Association's Diagnostic and Statistical Manual of Mental Health Disorder, Fourth Edition, Revised Text (DSM IV-TR), refers to atypical autism as PDD-NOS.