Code point
U+2415
Glyph appearance depends on your fonts.
U+2415
SoU+2415 SYMBOL FOR NEGATIVE ACKNOWLEDGE is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Control Pictures block.
Choose the representation you need, then copy its value.
U+2415
9237
␕
␕
E2 90 95
2415
00002415
%E2%90%95
\u2415
\u2415
\u2415
\2415