Use the stix package in your LaTeX document to create triangle symbols
\usepackage{stix}
Nabla

\nabla

\nabla
Greek Capital Letter Delta

\Delta

\Delta
Combining Enclosing Upward Pointing Triangle

\enclosetriangle

\enclosetriangle
Increment

\increment

\increment
Right Triangle

\varlrtriangle

\varlrtriangle
Conical Taper

\conictaper

\conictaper
Black Lower Right Triangle

\lrblacktriangle

\lrblacktriangle
Black Lower Left Triangle

\llblacktriangle

\llblacktriangle
Black Upper Left Triangle

\ulblacktriangle

\ulblacktriangle
Black Upper Right Triangle

\urblacktriangle

\urblacktriangle
Black Up-Pointing Triangle

\bigblacktriangleup

\bigblacktriangleup
Black Up-Pointing Small Triangle

\blacktriangle

\blacktriangle
Black Right-Pointing Triangle

\blacktriangleright

\blacktriangleright
Black Right-Pointing Small Triangle

\smallblacktriangleright

\smallblacktriangleright
White Right-Pointing Small Triangle

\smalltriangleright

\smalltriangleright
Black Right-Pointing Pointer

\blackpointerright

\blackpointerright
White Right-Pointing Pointer

\whitepointerright

\whitepointerright
Black Down-Pointing Triangle

\bigblacktriangledown

\bigblacktriangledown
White Down-Pointing Triangle

\bigtriangledown

\bigtriangledown
Black Down-Pointing Small Triangle

\blacktriangledown

\blacktriangledown
White Down-Pointing Small Triangle

\triangledown

\triangledown
Black Left-Pointing Triangle

\blacktriangleleft

\blacktriangleleft
Black Left-Pointing Small Triangle

\smallblacktriangleleft

\smallblacktriangleleft
White Left-Pointing Small Triangle

\smalltriangleleft

\smalltriangleleft
Black Left-Pointing Pointer

\blackpointerleft

\blackpointerleft
White Left-Pointing Pointer

\whitepointerleft

\whitepointerleft
White Up-Pointing Triangle with Dot

\trianglecdot

\trianglecdot
Up-Pointing Triangle with Left Half Black

\triangleleftblack

\triangleleftblack
Up-Pointing Triangle with Right Half Black

\trianglerightblack

\trianglerightblack
Upper Left Triangle

\ultriangle

\ultriangle
Upper Right Triangle

\urtriangle

\urtriangle
Lower Left Triangle

\lltriangle

\lltriangle
Lower Right Triangle

\lrtriangle

\lrtriangle
White Triangle Containing Small White Triangle

\whiteinwhitetriangle

\whiteinwhitetriangle
Triangle with Dot Above

\triangleodot

\triangleodot
Triangle with Underbar

\triangleubar

\triangleubar
S In Triangle

\triangles

\triangles
Down-Pointing Triangle with Left Half Black

\downtriangleleftblack

\downtriangleleftblack
Down-Pointing Triangle with Right Half Black

\downtrianglerightblack

\downtrianglerightblack
White Up-Pointing Triangle

\triangle

\triangle
Normal Subgroup Of

\lhd

\lhd
Contains as Normal Subgroup

\rhd

\rhd
Normal Subgroup of or Equal To

\unlhd

\unlhd
Contains as Normal Subgroup or Equal To

\unrhd

\unrhd
Triangle with Serifs at Bottom

\triangleserifs

\triangleserifs
White Hourglass

\hourglass

\hourglass
Black Hourglass

\blackhourglass

\blackhourglass
Plus Sign In Triangle

\triangleplus

\triangleplus
Minus Sign In Triangle

\triangleminus

\triangleminus
Multiplication Sign In Triangle

\triangletimes

\triangletimes
Z Notation Domain Antirestriction

\dsub

\dsub
Z Notation Range Antirestriction

\rsub

\rsub
Delta Equal To

\triangleq

\triangleq
Not Normal Subgroup Of

\nvartriangleleft

\nvartriangleleft
Does Not Contain as Normal Subgroup

\nvartriangleright

\nvartriangleright
Not Normal Subgroup of or Equal To

\ntrianglelefteq

\ntrianglelefteq
Does Not Contain as Normal Subgroup or Equal

\ntrianglerighteq

\ntrianglerighteq
Normal Subgroup Of

\vartriangleleft

\vartriangleleft
Contains as Normal Subgroup

\vartriangleright

\vartriangleright
Normal Subgroup of or Equal To

\trianglelefteq

\trianglelefteq
Contains as Normal Subgroup or Equal To

\trianglerighteq

\trianglerighteq
White Up-Pointing Small Triangle

\vartriangle

\vartriangle
Left Triangle Beside Vertical Bar

\ltrivb

\ltrivb
Vertical Bar Beside Right Triangle

\vbrtri

\vbrtri
Right Triangle Above Left Triangle

\rtriltri

\rtriltri
Large Left Triangle Operator

\bigtriangleleft

\bigtriangleleft
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