Code point
U+225C
Glyph appearance depends on your fonts.
U+225C
SmU+225C DELTA EQUAL TO is a Unicode 16.0.0 character in the Math Symbol category. It belongs to the Mathematical Operators block.
Choose the representation you need, then copy its value.
U+225C
8796
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E2 89 9C
225C
0000225C
%E2%89%9C
\u225C
\u225C
\u225C
\225C