shadow box

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A shallow, framed, rectangular box usually with a glass front that is used for holding and protecting items on display.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb Alternative form of shadow-box.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a shallow rectangular box with a transparent front used to protect and display small items (jewelry, coins, etc.)