In many instances they are. Especially so where many different languages are used, such as at international airports.
See Wikipedia page "Pictorial Push Pull Signs for Doors".
Stefan Horn has written: 'Signs of the city' -- subject(s): City and town life, Pictorial works, Signs and symbols
the difference between the pictorial diagram and schematic diagram is that the pictorial diagram shows the external appearance of the circuit.while the schematic diagram shows only the electrical symbol of the circuit..
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Hieroglyphic.
Frank Costantini has written: 'Hong Kong sign book' -- subject(s): Pictorial works, Signs and signboards
Both "pictorial" and "straight" can be used to describe lines. "Pictorial" typically refers to lines or images that are visually representational or graphic in nature, while "straight" describes lines that are not curved or bent in any way.
Lorenzo Elbaz has written: 'Mediterranean graphicity' -- subject(s): Architectural Decoration and ornament, Pictorial works, Signs and signboards
Laboratory safety signs are used for the same purpose as all other signs. They are used to provide information, cautions, warnings and reminders.
Some examples of caution signs used in the workplace are: Asbestos - do not disturb, biohazards - no food in unit, biohazards - no food in area, carcinogen - authorized person only and chemicals - no food in area.
Neon signs are mostly used in bars or as advertisment.