Hi, you may be referring to the "KUMQUAT"-- a type of citrus fruit from a shrubby, slow-growing tree that is native to Asian countries. Some countries regard the tree and fruits of the kumquat to be a lucky charm or a prosperity magnet. In Chinese, the KUMQUAT is translated in English as "Golden Mandarin." Though like an orange, it is smaller in size. There are round and elongated varieties. The round ones are about 1-2" in diameter.
You can see a lot of these during the Chinese Lunar New Year where they are hung outside homes or decorated on top of doors for good luck.