"µm" is the scientific symbol for micrometers (µ is the Greek lowercase letter "mu").
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A watch glass hasn't a symbol.
I assume you mean micrometre, but I will give symbols for micrometre and millimetre. Micrometre is μm and millimetre is mm. The μ is the greek letter mu, used I assume because the m is used for milli already.
The ticker symbol for Thermo Electron Corporation is TMO.
The scientific symbol for a Bunsen burner is a simple drawing of the device, typically represented by a small circle with a flame on top.
A micrometer is smaller than a meter. One micrometer is equal to one-millionth of a meter.