si

[Chinese. 絲 traditional; 丝 simplified]

The word also means “thread” or “silk.” Previously romanized as szu¹ and ssu.

A unit of length

In China,? – 20^th century, a unit of mass. In traditional measure, one hundred thousandth of a tael.

In the 20^th century, in the shì zhì system, = 0.5 milligrams.