To use the below set theory symbols in your LaTeX document then you need to add the below package in your LaTeX document

\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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