Free images results:
 

Signs pictures, stock photos and images

 
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Warning Stock Photo
Author: Marilyna
X file Stock Photography
Author: Jyothi
Blue hook Stock Photography
Author: Jyothi
Code Royalty Free Stock Images
Author: Lizzard2012
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
X & V signs Stock Photos
Author: N.l