Su-22 yellow red triangle markings ??

Hello there,
can anyone explain what the reversed yellow red triangle (nose) markings
mean on the SU-22 ?
While looking for pics they seem to be on every aircraft regardless from
which country they are.
TIA,
Erik Wauters, Belgium
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Erik Wauters
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OPASNO -- danger. They mean stay away from the nose intake.
Cookie Sewell
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AMPSOne

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