Thoschei

== English == === Etymology === Blend of Theta Sigma +‎ Koschei. Theta Sigma is derived from the Doctor's childhood nickname first mentioned in The Armageddon Factor the whilst Koschei is the Master's alias during childhood that was first introduced in the novel The Dark Path === Proper noun === Thoschei (fandom slang) The ship of characters The Doctor and The Master from the British science ficion television series Doctor Who.