calling card
noun
1
- chiefly N. Amer. a visiting card or business card〈主北美〉名片。
1.1
- figurative an action or the result of an action by which someone or something can be identified〈喻〉（可供识别的）行为; 结果：
the explosion was a taunting calling card from the terrorists.
这起爆炸是恐怖主义者的典型嘲弄行为。
2
- N. Amer. a phonecard or telephone charge card〈北美〉电话卡; 电话计费卡。