To be desired or approved of; very satisfactory, enjoyable, pleasant, or interesting.
Handshape: either "5-close" or "5-bent" is fine.
Gloss: /\YOUR BOOK/\ IX-me FINISH READ+++, [intj] VERY-GOOD[nod]
English equivalent: I've been reading your book. It's very good.
The intonation of the interjection (like "HEY") is a way of getting listener's attention. The gloss [nod] is an example of assertion.