Phlegm originates from the lungs. It is different from the mucus that is produced in the nasal passages. A common cause of phlegm is post nasal drip which is a symptom of sinus infections, colds, flu and inhalation of irritants. The diagnosis of the underlying condition could be made from the color of the phlegm.
A flow chart is a type of diagram representing a process using different symbols containing information about steps or a sequence of events. Each of these symbols is linked with arrows to illustrate the flow direction of the process.
A flowchart in computer science typically has the following types of symbols to represent a process or program: 1  Oval/Rounded Rectangle/Circle: Represents any process having a start and an end activity.  Rectangles: Represents a process activity or step.