指示者 meaning in English

demonstrator
designator
indicator

Iii the nominee shall not be responsible for any non - receipt of any instructions or for any ambiguities therein or lack of authority on the part of the person giving the instruction and no instructions shall be deemed to be received by the nominee until actual receipt thereof by the nominee by letter , telegram , telephone , telex , facsimile transmission or other electronic means
Iii对于未收到任何指示或指示中含糊不清之处或发出指示者本身缺乏授权，代理公司概不负责，直至代理公司实际接获透过函件电报电话电传图文传真或其他电子媒介发出之指示后，方被视为已接获指示