There is no official symbol for dark matter. This is because dark matter is a hypothetical form of matter that we cannot directly observe. We know it exists because of its gravitational effects on visible matter, but we haven't been able to detect it directly.
While scientists often use the term "dark matter" in their research, they haven't established a specific symbol to represent it. This is unlike other known particles like protons, neutrons, and electrons, which have designated symbols.
Therefore, when you see "DM" used in scientific papers or articles, it likely refers to "dark matter," but it is not an officially recognized symbol.
