Many (but not all) graphemes that are part of a writing system that encodes a full spoken language are included in the Unicode standard, which also includes graphical symbols. See:
Printing registration marks intended for the manufacturer of the packaging, to ensure different colors are aligned when printed
Various certification marks (see article for list) signifying conformance with a government or private organization's requirements
Shipping symbols[2] from ISO standard 780 "Pictorial marking for handling of goods"[3] or ASTM D5445 "Standard Practice for Pictorial Markings for Handling of Goods"[4] which depict shipping boxes as squares with rounded corners:
"Fragile": the silhouette of a broken wine glass
"This end up": a horizontal line with two arrows pointing up
"Do not stack": a filled-in box, under a crossed-out outlined box
"Maximum stack height": three boxes stacked vertically; the bottom one is filled in, the middle one is an outline with a number inside (the number of boxes to safely stack on top of this one), and the top one is an outline and crossed out
"Maximum stack weight": from the bottom upward: a box, a horizontal line, a wide arrow pointing down, and a number followed by "kg max"
"Keep dry": an umbrella with rain falling on it
"Protect from sunlight": a circle with rays coming out of it, with a box protected by a chevron
"Protect from radiation": the radiation symbol, separated from a box by a chevron
"Center of gravity": crosshairs pointing to the center of a dashed circle
"Do not roll": a box with a curved arrow above, and a cross-out line coming up from the box at an angle
"Do not use hand hooks"
"Do not use hand truck"
"Do not use forklift"
"Clamp as indicated": a filled-in box with a vertical line and inward-pointing arrow on the right and left
"Do not clamp": the same as "clamp as indicated", crossed out
"Sling here": the silhouette of a chain
A thermometer with a diagonal slash, indicating the maximum and minimum temperature
Property and pricing
U+2122™TRADE MARK SIGN
U+2120℠SERVICE MARK
U+00AE®REGISTERED SIGN
U+2117℗SOUND RECORDING COPYRIGHT
U+24CDⓍ, U+24E8 Ⓨ - Japanese typographic symbols used under Japan's resale price maintenance system