c
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I have provided you with a link. Search for subset and proper subset. You'll see the symbol. http://comers.citadel.edu/math_sym2005.htm#misc
Subset : The symbols ⊂ and ⊃(subset) A ⊆ B means every element of A is also an element of B
It looks like a big "C", with an underline. It can be compared to the "less-than-or-equal" symbol, but it is rounded instead of an angle symbol.
From the main menu, Select "Insert" then select "Symbol" Select Font = "Symbol" Scroll down to approx 3/4 of the way. The character code is 204.
the difference between a subset and a proper subset