Related Rule
Colombia
Practice Relating to Rule 9. Definition of Civilian Objects
Colombia’s Instructors’ Manual (1999) states:
A civilian object … is every object that is not a military objective. … In sum, it may be said that civilian objects are those objects which by their nature, location, purpose or use do not make an effective contribution to military action and whose total or partial destruction, capture or neutralization, in the circumstances ruling at the time, do not offer a definite military advantage. 
Colombia, Derechos Humanos & Derecho Internacional Humanitario – Manual de Instrucción de la Guía de Conducta para el Soldado e Infante de Marina, Ministerio de Defensa Nacional, Oficina de Derechos Humanos, Fuerzas Militares de Colombia, Santafé de Bogotá, 1999, pp. 16–17.
[emphasis in original]
In 2007, in the Constitutional Case No. C-291/07, the Plenary Chamber of Colombia’s Constitutional Court stated: “Civilian objects shall be ‘any objects that cannot be legitimately considered a military objective’ [quoting Prosecutor v. Tihomir Blaškić, Judgement, Trial Chamber I, 3 March 2000, Case No. IT-95-14-T].” 
Colombia, Constitutional Court, Constitutional Case No. C-291/07, Judgment of 25 April 2007, p. 94.