energy unit
slug
"An imperial gravitational unit which is equivalent to a mass that accelerates by 1ft/s² when a force of one pound (lbf) is exerted on it." [Wikipedia:Wikipedia]
slug based unit
slug
"An imperial gravitational unit which is equivalent to a mass that accelerates by 1ft/s² when a force of one pound (lbf) is exerted on it." [Wikipedia:Wikipedia]