Initialism for torpedo boat destroyer, an early destroyer warship.

• Historical naval classification abbreviation.

Sigla de destructor de torpederos, clase temprana de destructores.

• Abreviatura naval histórica.

Abbreviation meaning to be determined or decided later.

• Placeholder showing details are pending or not yet announced.

Abreviatura de por determinar o por decidir.

• Indicador de datos pendientes o aún no anunciados.