The symbol is the letter "d". Example: dm (decimeter). Note: The letter has to be in lowercase. Uppercase "D" means Deka, which is a factor of 10 instead of 0.1.
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The prefix deci means 1/10.
The metric prefix for one tenth is deci.
The symbol for the deci prefix is d. The symbol for gram is g. Therefore, the symbol for decigram is dg. Note that these symbols are case sensitive. It would be incorrect to write 'DG' or any other variation.
10
The prefix deci is used to denote one tenth.