T18

T18, sometimes written T-18, is a designation used for several unrelated topics. Notable uses include a genetic condition and a historical military vehicle.

In medicine: Trisomy 18 (Edwards syndrome) is a chromosomal abnormality in which a person has three copies of chromosome 18 in some or all cells. It occurs in about 1 in 5,000 live births. Affected individuals typically have severe developmental and physical anomalies, including distinctive facial features, heart defects, and organ malformations. The condition leads to significant medical challenges, and survival beyond the first year is relatively uncommon.

In military vehicles: The T-18 was a Soviet light tank developed in the early 1930s. It was intended for reconnaissance and infantry support and saw limited use before being superseded by more capable designs. Production numbers were small, and the vehicle was largely retired from front-line service in the mid- to late-1930s.

Note: T18 can refer to other topics in different contexts, depending on the field or discipline. When encountering the term, it is helpful to consider the surrounding subject area to determine whether the reference is medical, military, or another domain.