Definition of signs:
		
		
		(n) :
		
		(sometimes also used uncountably) A visible 
indication; a clearly visible object, generally flat, bearing a short message in words or pictures
		
 
								
				"their angry expressions were a clear sign they didn't want to talk."
			
			
	
		
		
		(v) :
		
		to 
write one's 
signature on (a document), thus showing authorship; to give legal consent by writing one's signature
		
 
								
				"I forgot to sign that letter to my aunt."