"Εκγόλπιο" has two meanings:
1) Jewel or small plate with decorative or symbolic writings/drawings, hung with a chain from the neck and lies on the chest. It is used also for Christian crosses.
2) Also used for titles of reference books or guides in simple language, usually of small size. ex: "Εγκόλπιος Ανθολογία".
---------------------------------------------------------------------------------------------------------------------------
Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.