Proper noun
Blissymbols
A constructed language using ideographs invented by Charles K. Bliss after the Second World War.
In Blissymbols, they are marked respectively by a small square symbol, a small cone symbol, and a small V or inverted cone. Source: Internet
It is not certain, however, that they have examined Blissymbols. Source: Internet
Since the 1960s/1970s, Blissymbols have become popular as a method to teach disabled people to communicate. Source: Internet
Thus natural languages are mainly oral, while Blissymbols is just a writing system dealing with semantics, not phonetics. Source: Internet