古代 在交通、 通信过 程中,为了便于管 理,保障 边境安全,在驿传 的各个环 节使用了多种多样的通行凭证。文字记载最早的 通行凭证 是战国时期各诸侯 国邮驿通 信中使用的符 信, 有 符 有 节 。所谓符,大多 是 军 事 凭 信 ,也作为国家治安 所规定的 通行证件。符一般分左右两 In ancient times, in the process of transportation and communication, in order to facilitate the management and ensure the border security, a variety of vouchers were used in every link of the post. The earliest passport is written in the Warring States Periods Posts and Telecommunications Posts used in the letter, there are symbols. The so-called symbols, mostly military ones, are also used as passports for national security. Character generally divided by two