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Question: Tell me what this Symbol means! Is the triangle symbol with an exclamation point an error message? If so what does 3403D mean when trying to start up MacBook Pro (late 2010) holding down D for diagnostic test?

Is the triangle symbol with an exclamation point an error message? If so what does 3403D mean when trying to start up MacBook Pro (late 2010) holding down D for diagnostic test?

MacBook Pro, (late 2010) El Capitan

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Question: Tell me what this Symbol means! Is the triangle symbol with an exclamation point an error message? If so what does 3403D mean when trying to start up MacBook Pro (late 2010) holding down D for diagnostic test?