Another indicator of the presence of medical waste, which may be used instead of or in addition to the red or orange color code, is the BIOHAZARD symbol. Medical waste from health care facilities must be treated in a way that destroys its potential for causing disease, prior to disposing it in a landfill.
In classical logic disjunctive syllogism (historically known as modus tollendo ponens) is a valid argument form which is a syllogism having a disjunctive statement for one of its premises.
In logic, or by itself means the inclusive or, distinguished from an exclusive or, which is false when both of its arguments are true, while an or is true in that case. An operand of a disjunction is called a disjunct.