Toc H is an international Christian movement. The name is an abbreviation for Talbot House, "Toc" signifying the letter T in the signals spelling alphabet used by the British Army in World War I. A soldiers' rest and recreation centre named Talbot House was founded in December 1915 at Poperinghe, Belgium. It aimed to promote Christianity and was named in memory of Gilbert Talbot, son of Lavinia Talbot and Edward Talbot, then Bishop of Winchester, who had been killed at Hooge in July 1915. The founders were Gilbert's elder brother Neville Talbot, then a senior army chaplain, and the Reverend Philip Thomas Byard (Tubby) Clayton. Talbot House was styled as an "Every Man's Club", where all soldiers were welcome, regardless of rank. It was "an alternative for the 'debauched' recreational life of the town".

A spelling alphabet is a set of words used to represent the letters of an alphabet in oral communication, especially over a two-way radio or telephone. The words chosen to represent the letters sound sufficiently different from each other to clearly differentiate them. This avoids any confusion that could easily otherwise result from the names of letters that sound similar, except for some small difference easily missed or easily degraded by the imperfect sound quality of the apparatus. For example, in the Latin alphabet, the letters B, P, and D sound similar and could easily be confused, but the words "bravo", "papa" and "delta" sound completely different, making confusion unlikely.