Decena

A decena (Spanish for "ten") is a group or set of ten units or elements. It is commonly used in Spanish-speaking contexts to refer to a quantity of ten.

In mathematics, a decena represents the quantity of ten in the decimal number system. It is a place value, where it represents 10 units. The place value system organizes numbers based on powers of ten: units (ones), decenas (tens), centenas (hundreds), and so on.

Outside of mathematics, "decena" can also refer to a set or collection of approximately ten items, although its usage in this sense is less precise than the mathematical definition. This usage is similar to the English words "decade" or "tenfold" when referring to a period of time or a multiplied quantity.