guideword

Mane (Îngilîzî)

1. A watchword; a word or phrase that serves as one's guide.
2. A word that is printed at the top or bottom of the page in a reference work, in order to help readers find a specific entry.
3. Any of the words in a memo or email that define metadata regarding the message, such as sender, recipient, and subject.

Hevwate

catchword

guide word

Etîmolojî (Îngilîzî)

From guide + word.