% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Other crossword clues for answer "CAPTCHA"

CAPTCHA
Personal check?
Reading comprehension test?
Test to ensure a response is not generated by a computer
Typing test?
One of those website security swirly letter thingies that you keep having to refresh to get one you can read
Modern test of humanity
Weapon against automated enemies
Challenge to prove you're human
Modern screen test
A test of one's humanity?
I'm not a robot test
Challenge for a web user
Test to keep out bots
Spell check?
Test to prove you're not a bot