SI-1

('si' in the first tone)

There are 49 standard Chinese characters with a 'si' pronunciation. Major sound-indicating components are: 思 (7),  斯 (6), 司 (4)

司 = to operate

公司 = gong(1)si(1) = company (the common last two characters of Chinese business names)

Similar characters:

词 = ci(2) = word

可 = ke(3) can (the single-character form is seldom used)

可以 = ke(3)yi(3) = can

河 = he(2) = river

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有限公司 = you(3)xian(4) gong(1)si(1) = limited company

有限 = you(3)xian(4) = limited

限 = xian(4) = limit, to restrict

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司机 = si(1)ji(1) = driver