'ST' (ii) was the designation of Allied convoys (together with a numerical and sometimes a literal suffix) plying the route from Freetown, Sierra Leone, to Takoradi, Gold Coast, and as such reciprocals of the 'TS' (i) series (August 1941/April 1945).

The first of these 94 'Sierra Leone to Takoradi' convoys was ST.1 of 26/31 August 1941 with the 2,407-ton British Bactria, 5,277-ton British Dahomian, 6,322-ton Belgian Mafuta and 5,636-ton British Tombouctou, and the last was ST.90 of 12/16 April 1945 with the 5,013-ton British David Livingstone, 2,865-ton British Empire Thackeray, 7,134-ton British Fort Augustus, 7,124-ton British Fort Slave, 4,897-ton British Glenwood, 7,079-ton British Indian City, 2,082-ton British Kajang, 8,059-ton British Lowlander, 5,962-ton Dutch Melampus, 6,095-ton British Prometheus, 2,465-ton Swedish Rigoletto and 7,219-ton British Samkansa.

In addition to ships destined for Takoradi in 'ST' proper, the 'STC' and 'STL' extended designations were used for convoys of vessels sailing onward to Cape Town in South Africa and Lagos in Nigeria respectively, and dispersed when clear of the U-boat 'hot spot' off Freetown.