I mean precious things in the 'magpile' sense. I forget who coined the term, but it approximately means the collection of random small objects that forms on your desk (or similar space), because they're interesting or important and don't have proper homes. Items that are on your desk because they're ornamental or something you use while at your desk (pens, etc) don't really qualify.
Mine currently consists of:
-Radiator Key
-Garmin HRM sensor
-Pair of 15mm steel rulers
-Assorted SIMs, SIM adaptors, SD and MicroSD cards
-USAnian 1 cent coin
-Hair tie
-4 BAHA test '
bite-bars' (Maybe one day we'll have enough for a chess set?)
-The Good Tweezers
-WiFi and ANT+ USB dongles
-Postage stamps
-Mystery screw