What does 签字 (qiān zì) mean in English?

Card 754HSK 2010 Level 5754/1311
CARD754
PROGRESS58%
签字
簽字
qiān zì
to sign (a signature)
Click to reveal
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Reveal: Click/Space/Enter/↑↓/w/s/j/k•Navigate: ←→/h/l/a/d