Triple X syndrome is also called trisomy X, triplo X syndrome and XXX syndrome.

CNN: Triple X syndrome

If this is the case, then the female is said to have a mosaic form of triple X syndrome.

CNN: Triple X syndrome

Because only some cells contain the extra X chromosome, females with the mosaic form of triple X syndrome may have less severe symptoms.

CNN: Triple X syndrome

Females with triple X syndrome have a third X chromosome.

CNN: Triple X syndrome