Cylon Centurion character jug produced in Thailand for Universal Network Television of Universal City, California, circa 2011. Modern Centurions serve a variety of functions within the Cylon hierarchy, acting as guards, soldiers, executioners and even gardeners. "Bullethead", "clanker" and "chrome job" are common Colonial nicknames for these advanced and deadly Cylon constructs. They are also referred to as "toasters" - the common Colonial nickname for the Cylon race as a whole. Although Centurions are sentient by design, an implant annuls their higher cognitive functions and prevents them from exercising full self-awareness. It also appears that this implant precludes them from harming any of the humanoid Cylons.