A staff with a single serpent coiled around it, associated in Greek mythology with Asclepius, the god of medicine.
A winged staff with two serpents wound around it, originally the attribute of Hermes (Mercury), the messenger god.
A trefoil of overlapping circles, designed to be instantly recognisable as a warning for biological hazards.
A black skull and crossbones in a red-bordered diamond, the GHS symbol for acute toxicity.
A black human silhouette with a starburst on the chest, in a red-bordered diamond — the GHS symbol for serious, longer-term health hazards.
A blue six-barred star with a serpent-and-staff at its centre, marking emergency medical services.
A serpent coiled around a stemmed bowl, marking pharmacy.
A capital T, the SI unit symbol for the tesla.
The two letters Bq, the SI unit symbol for the becquerel.
The two letters Sv, the SI unit symbol for the sievert.