Pay attention to your reference designators. Uxx usually refers to ICs, Crystals can be U or X. CR components are typically diodes, but not in this case. Look at the device. The number LM385 tells you what it is. It is a Micropower Voltage Reference Diode http://www.national.com/pf/LM/LM385-1.2.html#Overview. Do a Google search on "LM385" for more info.