Personal check?

• Modern screen test
• "I'm not a robot" test
• Test to ensure a response is not generated by a computer
• Test for screening out bots
• Weapon against automated enemies
• Letters you see to be typed, for example S-K-I-P T-E-A
• Suitable leaders of children's holiday activities go after Conservative - it proves humanity
• Challenge to prove you're human
• Reading comprehension test?

Wikipedia Word definitions in Wikipedia
A CAPTCHA (a backronym for " C ompletely Automated P ublic Turing test to tell C omputers and H umans A part") is a type of challenge-response test used in computing to determine whether or not the user is human. The term was founded in 2003 by Luis von ...