Word

HSK	Not in HSK
FREQUENCY	Unknown

验证码 yàn zhèng mǎ

DEFINITIONS

verification code
CAPTCHA, a type of challenge-response test (computing)

CHARACTERS

验 yàn HSK 4	test, examine, inspect; verify
证 zhèng HSK 4	prove, confirm, verify; proof
码 mǎ HSK 4	number, numerals; yard; symbol