Filter by category:
Filter by group:
 | Cinnabar (alternate #2) A symbol used to designate cinnabar, a bright red mineral with a rather toxic physical nature, in the 18th century text of Diderot's Encyclopedia. |
 | Cuprum arsenicatum (alchemy) The alchemical symbol for Cuprum arsenicatum, a compound of copper and arsenic. |
 | Sal alcalinus A symbol used in alchemy to indicate alkaline salt, which is composed of sodium and potassium. |
 | Danger of arrest In the British system of hobo signs, this symbol means that the people here will try to get you arrested, so beware. |
 | Glass (alternate #1) A symbol used to represent glass in medieval alchemy. |
 | Glass (alternate #2) In the alchemical traditions of the late Middle Ages, this symbol represented glass. |
 | Wood (alchemy) An alchemical symbol representing wood. |
 | Wood (alternate #1) While at first glance this symbol may be mistaken for a warped version of the anarchy logo, it is in fact one of the symbols used in alchemy to denote wood. |
 | Day (alchemy) While this symbol can have different meanings in different fields, in the alchemical traditions of the Middle Ages it was used as a "time sign" to indicate day. |
 | Oil (alternate #1) An alchemical symbol used to designate oil. |
 | Oil (alternate #2) An alchemical symbol used to designate oil. |
 | Oil (alternate #3) An alchemical symbol used to designate oil (especially olive oil in this case). |
 | Horse dung (alchemy) A symbol used by alchemists to represent horse dung. |
 | Horse dung (alternate) A symbol used by alchemists to represent horse dung. |
 | Soap (alchemy) A symbol used in alchemy to represent soap. |
 | Authority A symbol from the French system of hobo signs indicating that an authority figure lives at this location. |
 | Good road Strongly resembling the common symbol for a ban or prohibition, in the United States system of hobo signs, this mark indicates that the current road is a good one to follow. |
 | Wax (alchemy) A symbol used in alchemy to denote wax or oil. |
 | Arsenic acid (alchemy) The alchemical and early chemical symbol for arsenic acid, or acidum arsenici. |
 | Oil (alternate #4) An alchemical symbol used to designate oil. |
 | Wax (alternate #1) A symbol used in alchemy to denote wax or oil. |
 | Oil (alternate #5) An symbol used in 17th century alchemy to designate oil. |
 | Wax (alternate #2) A symbol used in alchemy to indicate wax or olive oil. |
 | Process (alchemy) When it comes to this symbol, the word "process" can imply a number of different things. |
 | Calcinated copper (alternate #3) or nickel In alchemy, this symbol could indicate either calcinated copper or the metal nickel. |
