Using symbols in your campaign is very easy, and can help put emphasis on a particular aspect, or allow your players to better find themselves as their characters. Having a special way to communicate has a lasting effect, and can be the detail you need to make a moment.
By being able to quantify in symbols, and some examples of what different things mean, you can make your own key or legend: Allowing symbols to be manipulated by the players gives a chance for them to become their character momentarily.
You are free to develop your own symbols and meanings, making them situation specific or character specific. Allowing a player to build on the current narrative and develop their own method of symbol usage can benefit everyone.
For the picture of the canvas, I used common alchemic symbols and their most associated meaning. It was super easy to measure a grid and keep the size of the symbols the same. I used a 12x48 Inch Black Canvas, and measured Eighteen 4x4 inch squares to draw in. I painted on an easel, but in hindsight should have done it on a flat surface to avoid the dripping. I used Titanium White Acrylic Paint.
Here is a key to the symbols in the picture, and what they are suppose to mean. I had just Googled each of their definitions, and copied here.
Pound - Weight 
16 Ounces, 1 Pint 
 | 
  
- Saltpeter - 
a
   white crystalline salt, occurring naturally and produced
   synthetically, used in fertilizer, as a meat preservative, and as
   a constituent of gunpowder. 
    
 | 
  
Salt 
is
   a mineral composed primarily of sodium chloride, a chemical
   compound belonging to the larger class of salts. 
 | 
 
Pint - Volume 
16 Ounces, 1 Pound 
 | 
  
Sulfur 
is
   a bright yellow, crystalline solid at room temperature. 
 | 
  
Gold 
a
   yellow precious metal, the chemical element of atomic number 79,
   used especially in jewelry and decoration and to guarantee the
   value of currencies. 
 | 
 
Ounce – Weight 
1/16 Pound 
 | 
  
Lead 
is
   a heavy metal that is denser than most common materials. Lead is
   soft and malleable, and also has a relatively low melting point. 
 | 
  
Copper 
is
   a soft, malleable, and ductile metal with very high thermal and
   electrical conductivity. 
 | 
 
Dram - Weight 
1/8 Ounce 
 | 
  
Tin 
is
   a silvery metal that characteristically has a faint yellow hue.
   Tin, like indium, is soft enough to be cut without much force.
   
    
 | 
  
Copper Acetate 
appears
   as a blue-green crystalline solid.
   The
   hydrated derivative, which contains one molecule of water for each
   Cu atom. 
 | 
 
Scruple - Weight 
1/3 Dram 
 | 
  
Phosphorus 
exists
   in two major forms, white phosphorus and red phosphorus, but
   because it is highly reactive, phosphorus is never found as a free
   element. 
 | 
  
Iron 
is
   a mineral that our bodies need for many functions. It
   is by mass the most common element. 
 | 
 
Pinch - Weight 
1/4 Scruple 
 | 
  
Sulfuric Acid 
is
   a colorless, odorless, and syrupy liquid that is soluble in water
   and is synthesized in reactions that are highly exothermic. 
 | 
  
Quick Silver 
is
   a heavy, silvery-white liquid metal. Compared to other metals, it
   is a poor conductor of heat, but a fair conductor of electricity. 
 | 
 
