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
c
Subset : The symbols ⊂ and ⊃(subset) A ⊆ B means every element of A is also an element of B
In set theory, the symbol for a set is typically represented by uppercase letters, such as (A) or (B). The symbol for a subset is denoted by the symbol "⊆", meaning that every element of the subset is also an element of the larger set. If a set is a proper subset (meaning it is not equal to the larger set), the symbol "⊂" is used. Additionally, the symbol "∅" represents the empty set, which is a set that contains no elements.
The symbol for a proper subset is "⊂". A set A is considered a proper subset of set B (denoted as A ⊂ B) if all elements of A are in B, and B contains at least one element not in A. This means A cannot be equal to B; it must have fewer elements.
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.
c
Subset : The symbols ⊂ and ⊃(subset) A ⊆ B means every element of A is also an element of B
The symbol for a proper subset is "⊂". A set A is considered a proper subset of set B (denoted as A ⊂ B) if all elements of A are in B, and B contains at least one element not in A. This means A cannot be equal to B; it must have fewer elements.
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
Since ASCII ⊊ unicode, I don't know if there are ASCII codes for subset and proper subset. There are Unicode characters for subset and proper subset though: Subset: ⊂, ⊂, ⊂ Subset (or equal): ⊆, ⊆, ⊆ Proper subset: ⊊, ⊊,
Because every set is a subset of itself. A proper subset cannot, however, be a proper subset of itself.
A is a subset of a set B if every element of A is also an element of B.
The symbol for the complement of a set is typically represented by a superscript "c" or a prime symbol (e.g., (A^c) or (A')). It denotes all the elements in the universal set that are not in set (A). For example, if the universal set is (U) and (A) is a subset of (U), then (A^c = U - A).
give example of subset
A subset of a set S can be S itself. A proper subset cannot.