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Jyutping saam1 si1
Pinyin sān sī

Definitions (Wiktionary)
  1. noun, collective, historical, name
    three provincial-level officers during the Ming and Qing dynasties (布政使司 (bùzhèngshǐsī), 按察使司 (àncháshǐsī) and 都指揮使司/都指挥使司 (dūzhǐhuīshǐsī))
  2. noun, collective, historical, name
    three national-level officers during the Tang dynasty (御史臺/御史台, 中書省/中书省 (Zhōngshūshěng), 門下省/门下省; or 刑部 (Xíngbù), 御史臺/御史台, 大理寺)
  3. noun, collective, historical, name
    three financial officers during the Song dynasty (鹽鐵司/盐铁司, 度支司 and 戶部司/户部司)
  4. noun, collective, historical, name
    three national-level ministers during the Han dynasty (司馬/司马 (sīmǎ), 司空 (sīkōng) and 司徒 (sītú))
  5. noun, collective, name
    three officers of Hong Kong (Chief Secretary for Administration, Financial Secretary and Secretary for Justice)
Examples (粵典–words.hk)
  1. Cantonese
    警察嘅升级面试由一名警司联同两个总督察进行提问,俗称「三司会审」,每年千多人应试只有三份之一成功,十分严格。
    警察嘅升級面試由一名警司聯同兩個總督察進行提問,俗稱「三司會審」,每年千多人應試只有三份之一成功,十分嚴格。
    • The promotion interview board of police department is a joint hearing by a superintendent and 2 chief inspectors, every year over thousand of policeman applied for promotion but only one third of them can pass, it is really strict.
  2. Cantonese
    响香港想攞牌照开电视台,唔止要律政司、财政司、政务司「三司会审」,仲要经行政会议同行政长官𠮶关,反政府嘅传媒想开电视台几乎系无可能。
    響香港想攞牌照開電視台,唔止要律政司、財政司、政務司「三司會審」,仲要經行政會議同行政長官嗰關,反政府嘅傳媒想開電視台幾乎係無可能。
    • To get a license for starting a TV boardcast business Hong Kong, not only have to undergo a joint hearing by the 3 highest departments of HK government, but also need to be examined by the Executive Council and the Chief Executive, an anti-government media is nearly impossible to start a TV channel.