![](http://www.alamy.com/thumbs/6/EC80C06A-B98B-49F7-A3A1-611B038F079F/R24GXW.jpg)
3d rendering shiny question mark with black question marks background
Size: 5500px × 4125px
Photo credit: © Kittipong Jirasukhanont / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: 3d, banner, challenge, confuse, contest, exam, examinor, faq, game, icon, illustration, letters, mark, problem, query, question, questioner, quiz, quizzer, rendering, sign, symbol, test, thinking