Dec, as in Decimal or Decade.
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The prefix deci means 10th (1/10) 10.
"Micro micro" was an older designation used for a metric prefix that is now known as the prefix "pico," which represents one trillionth (1/1,000,000,000,000). The use of "micro micro" was eventually replaced by the standardized SI prefixes to avoid confusion.
The prefix deca- means ten. It is used in the metric system to denote a factor of ten, such as decagram (10 grams) or decimeter (1/10 of a meter).
The metric prefix deci- represents a factor of 0.1, which means one-tenth or 1/10 of the base unit. It is often used in the metric system to denote a fraction of a unit.
The prefix that means thousands in the metric system is "kilo-". It represents a factor of 1000.