Use the stix package in your LaTeX document to create below set theory symbols
\usepackage{stix}
Empty Set

\varnothing

\varnothing
Empty Set

\emptyset

\emptyset
Reversed Empty Set

\revemptyset

\revemptyset
Empty Set with Overbar

\emptysetobar

\emptysetobar
Empty Set with Small Circle Above

\emptysetocirc

\emptysetocirc
Empty Set with Right Arrow Above

\emptysetoarr

\emptysetoarr
Empty Set with Left Arrow Above

\emptysetoarrl

\emptysetoarrl
Open Subset

\subsetcirc

\subsetcirc
Open Superset

\supsetcirc

\supsetcirc
Intersection

\cap

\cap
Union

\cup

\cup
Double Intersection

\doublecap

\doublecap
Double Union

\doublecup

\doublecup
Multiset

\cupleftarrow

\cupleftarrow
Multiset Multiplication

\cupdot

\cupdot
Multiset Union

\uplus

\uplus
Subset Of

\subset

\subset
Superset Of

\supset

\supset
Not A Subset Of

\nsubset

\nsubset
Not A Superset Of

\nsupset

\nsupset
Subset of or Equal To

\subseteq

\subseteq
Superset of or Equal To

\supseteq

\supseteq
Neither A Subset of Nor Equal To

\nsubseteq

\nsubseteq
Neither A Superset of Nor Equal To

\nsupseteq

\nsupseteq
Subset of with Not Equal To

\subsetneq

\subsetneq
Superset of with Not Equal To

\supsetneq

\supsetneq
Double Subset

\Subset

\Subset
Double Superset

\Supset

\Supset
Reverse Solidus Preceding Subset

\bsolhsub

\bsolhsub
Superset Preceding Solidus

\suphsol

\suphsol
Subset Above Rightwards Arrow

\subrarr

\subrarr
Leftwards Arrow Through Subset

\leftarrowsubset

\leftarrowsubset
Superset Above Leftwards Arrow

\suplarr

\suplarr
Subset with Dot

\subsetdot

\subsetdot
Superset with Dot

\supsetdot

\supsetdot
Subset with Plus Sign Below

\subsetplus

\subsetplus
Superset with Plus Sign Below

\supsetplus

\supsetplus
Subset with Multiplication Sign Below

\submult

\submult
Superset with Multiplication Sign Below

\supmult

\supmult
Subset of or Equal to with Dot Above

\subedot

\subedot
Superset of or Equal to with Dot Above

\supedot

\supedot
Subset of Above Equals Sign

\subseteqq

\subseteqq

\nsubseteqq
Superset of Above Equals Sign

\supseteqq

\supseteqq

\nsupseteqq
Subset of Above Tilde Operator

\subsim

\subsim
Superset of Above Tilde Operator

\supsim

\supsim
Subset of Above Almost Equal To

\subsetapprox

\subsetapprox
Superset of Above Almost Equal To

\supsetapprox

\supsetapprox
Subset of Above Not Equal To

\subsetneqq

\subsetneqq
Superset of Above Not Equal To

\supsetneqq

\supsetneqq
Closed Subset

\csub

\csub
Closed Superset

\csup

\csup
Closed Subset or Equal To

\csube

\csube
Closed Superset or Equal To

\csupe

\csupe
Subset Above Superset

\subsup

\subsup
Superset Above Subset

\supsub

\supsub
Subset Above Subset

\subsub

\subsub
Superset Above Superset

\supsup

\supsup
Superset Beside Subset

\suphsub

\suphsub
Superset Beside and Joined By Dash with Subset

\supdsub

\supdsub
Intersection with Dot

\capdot

\capdot
Union with Minus Sign

\uminus

\uminus
Union with Overbar

\barcup

\barcup
Intersection with Overbar

\barcap

\barcap
Intersection with Logical And

\capwedge

\capwedge
Union with Logical Or

\cupvee

\cupvee
Union Above Intersection

\cupovercap

\cupovercap
Closed Union with Serifs

\closedvarcup

\closedvarcup
Closed Intersection with Serifs

\closedvarcap

\closedvarcap
Closed Union with Serifs and Smash Product

\closedvarcupsmashprod

\closedvarcupsmashprod
Intersection Beside and Joined with Intersection

\twocaps

\twocaps
Union Beside and Joined with Union

\twocups

\twocups
Intersection Above Bar Above Union

\capbarcup

\capbarcup
Union Above Bar Above Intersection

\cupbarcap

\cupbarcap
Intersection Above Union

\capovercup

\capovercup
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