Micro
The micro is a prefix indicating 10-6 in the SI system. It came from the Greek μικρός, meaning "small". The micro symbol μ is the Greek letter mu. In Unicode, a micro symbol representing a micro is assigned to U + 00B5, and a Greek character Mu is assigned to U + 03BC. In HTML, you can write micros in \u0026 amp; micro; In an environment where only Roman can be used, u is sometimes used instead. μm and uV, respectively. Depending on the case, μg may be written as mcg. However, this notation is not standard.