"Biohazards are warning signs given, so that people those potentially exposed to the substances will know about the danger and take precautions. The United States Centers for Disease Control and Prevention (CDC) categorizes various diseases in levels of biohazard, Level 1 being minimum risk and Level 4 being extreme risk. Laboratories and other facilities are categorized as Biosafety Level (BSL) 1-4 or as P1 through P4 for short (Pathogen or Protection Level).
Biohazard Level 1, Biohazard Level 2 , Biohazard Level 3, Biohazard Level 4. The biohazard symbol was developed by the Dow Chemical Company in 1966 for their containment products
The symbols investigated had to meet a number of criteria: Striking in form in order to draw immediate attention; Unique and unambiguous, in order not to be confused with symbols used for other purposes; Quickly recognizable and easily recalled; Easily stenciled; Symmetrical, in order to appear identical from all angles of approach; Acceptable to groups of varying ethnic backgrounds.
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Last date updated on June, 2014