His broadcasting sign-off consisted of a nonsense word, "thermostrockimortimer," the meaning of which (if any) was never made public. Cactus stated that, "The phrase is in the Bible; if you don't find it, keep reading."
The sign-off phrase "thermostrockimortimer" was an enigmatic expression that Cactus linked to biblical scripture, although its actual significance or purpose was never explained.