This is a slightly ambiguous and unsatisfactory situation. (you can view the symbols I will be discussing in the document <http://amath.Colorado.edu/documentation/LaTeX/Symbols.pdf >)
The relation "contained in" is commonly denoted by the symbol which would be typeset in latex by $\subseteq$. The answer to your question ought to be $\subset$, but is not, because the meaning of $\subset$ within the mathematical culture is more or less synonymous with a slightly vaguer version of $\subseteq$. More precise symbols to convey "properly contained in" in latex are $\subsetneq$,\varsubsetneq, \subsetneqq and \varsubsetneqq --I don't know if there is a MSWord version of these symbols. However, the use of these symbol is uncommon and unexpected: even though people will guess that you mean "properly contained" when you use these symbols, but you had better advertise your meaning in words to confirm the guess
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Well it's the most simplest question I know, it's the + symbol and if you're in Mrs. Johnsons class..... you're too funny!!! :)
It contained a zero symbol which made arithmetic a lot easier.
Because the Hindu-Arabic numeral system contained a zero symbol which made mathematical calculations a lot simpler than the Roman numeral system which didn't have a zero symbol.
Because of the introduction of the Hindu-Arabic numeral system during the Middle Ages which was more efficient than the Roman numeral system inasmuch that it contained a zero symbol.
Is true