Insignia Description
A Silver color metal and enamel device 1 5/32 inches (2.94 cm) in height overall, consisting of a shield blazoned: Tenné, a chevron abased Argent semé-de-lis Azure, overall a telephone pole radiant with four lightning flashes of the second. Attached below the shield a Silver scroll inscribed “VIRTUTE ET LABORE” in Orange letters.

Symbolism
Orange and white are colors traditionally associated with the Signal Corps. The unit’s World War II European campaign honors are symbolized by the fleurs-de-lis. The unit’s historic affiliation with a telephone company and the former signal construction mission are depicted by the telephone pole, which also represents the organization’s headquarters in Maryland, a state noted as the home of the first telegraph line. The translation of the motto is “By Courage and Work.”

History
The distinctive unit insignia was approved on 18 March 1955. It was updated to delete the Army Reserve affiliation on 4 September 1969. It was amended to revise the description and symbolism on 19 July 1991.

Source: The US Army Institute of Heraldry