Biohazard meaning
The biohazard symbol was designed in 1966 at Dow Chemical by Charles L. Baldwin’s group, for the National Cancer Institute. It was chosen because test subjects remembered it and because it had no prior meaning. It marks biological risk. It is not an old plague sign.
A mark chosen because people would remember it and because it did not already mean anything.
The name. Biohazard is a twentieth-century compound: biological hazard. The word and the mark were developed together for a labeling problem. The mark is not a folk sign that later received a scientific name.
Where it comes from
Laboratories needed a label for infectious agents that would not depend on English. Charles L. Baldwin, an environmental-health engineer at Dow, led the work under a contract with the National Cancer Institute. The team drew candidates and tested them. The criteria were practical: the mark should be memorable, it should be distinct from other marks, it should be drawable with a stencil, it should be symmetric so it would not be pasted upside down by mistake, and it should be meaningless in advance so no old association would interfere. The surviving design is four circles overlapping a central ring, the form people now call the biohazard. Baldwin published the account in Science in 1967. The mark spread from cancer-research labeling into hospital waste, shipping, and public health. Unicode encodes it as BIOHAZARD SIGN, U+2623, ☣. The emptiness was the point in 1966. It is no longer empty. A reader who finds it on a drum is being told about viable organisms that can infect. A reader who finds it on a shirt is looking at a quotation. The lexicon’s drawing is a schematic of the overlapping circles, not a trace of a standards-body master file.
Modern
Meaningless on purpose, then not
The design brief asked for a symbol with no history. That is the opposite of almost every other page in this cabinet. The test was psychological: which drawing stuck, and which drawing did not already say “danger” in some other trade. Once the National Cancer Institute and then the wider biosafety practice adopted it, the history started. It is a short history, and it is dated. A claim that the mark is an ancient quarantine sign is false. Quarantine had other marks. This one is Dow, 1966.
Modern
What the label is doing
On a container the mark says the contents are a biological hazard and should be handled under the rules printed beside it. The picture does not specify the organism. The word or the transport class does that work. On a costume the mark specifies nothing and warns no one in the room. Both uses are visible in the world. Only one of them is the job the symbol was paid to do. The page is about the job.
In popular culture
game · 1996
Resident Evil (Biohazard in Japan)
Capcom's series is titled Biohazard in Japan; in 1994 US marketers could not secure the name because a DOS game and a New York hardcore band already used it, so a staff contest produced 'Resident Evil'.
The word, and the horror it names, became a franchise; the Dow sign stays on the Umbrella lab doors.
Sourcemusic · 1987
Biohazard (band)
Brooklyn hardcore band whose name blocked Capcom's US title.
Brooklyn hardcore band whose name blocked Capcom's US title, which is a later reading of the mark.
SourceWorth knowing
Questions
What does the Biohazard mean?
The biohazard symbol was designed in 1966 at Dow Chemical by Charles L. Baldwin’s group, for the National Cancer Institute. It was chosen because test subjects remembered it and because it had no prior meaning. It marks biological risk. It is not an old plague sign.
How do I type the Biohazard?
The character is ☣ (U+2623).
Why does Resident Evil use the biohazard symbol?
Capcom's series is titled Biohazard in Japan; in 1994 US marketers could not secure the name because a DOS game and a New York hardcore band already used it, so a staff contest produced 'Resident Evil'. The word, and the horror it names, became a franchise; the Dow sign stays on the Umbrella lab doors.
Near this
- Radiation trefoilA mark for a source that can injure you without looking like fire.
- Power symbolA one breaking a zero. It means standby, not off.
- Fallout shelterThree triangles in a circle, meaning a place rated to keep fallout out.
- AtomA nucleus and three orbits. A picture of a teaching model, not of an atom.
Sources
Named when the entry depends on a text, a date, or a standard. Catalog numbers are not invented.
Your margin
Private. It stays in this browser and never joins the canon.
symbol.wiki, edited as Sigilla. Last reviewed 20 October 2026. A reading of public tradition, not a ruling.