The word "7" appears to be a typographical error, as it does not conform to any known word in English. However, if we consider the context, it seems likely that you may have intended to refer to the number "seven." In English, "seven" is a numerical value that comes after six and before eight. It is often used in counting and to denote a quantity.
The word "seven" comes from the Old English "seofon," which is derived from the Proto-Germanic sebun and the Proto-Indo-European septm̥. This root is connected with various forms of the word in other languages, such as "siete" in Spanish and "sept" in French.
If you intended a different word, please provide clarification.