1. Toxic - a picture of a scull
2. Flammable - a picture of a flame
3. Corrosive - two test tubes with liquid spilling on an hand and a bench
4. Radioactive - a picture of the nuclear symbol
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sorry but this is not the correct answer to the question you have asked but it is related but these very inventive signs they were also used for literacy thanks again .....by emily
Data source is used to convey data symbols.
Not all symbols are used in writing, because some can be used in different languages and in different countries.
0123456789
There are 16 symbols. The number of symbols is always the same as the base.