In classical poetry shìzǐ often stands for 'monk'.
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释 is the Chinese surname adopted by Buddhist monks since 道安 (Dao'an, 4th century AD), short for 释迦 ('Shakya' - the Buddha's clan). 释子 literally means 'son/disciple of Shakyamuni'. The everyday word for monk is 和尚 (héshang) or 僧人 (sēngrén).