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Jyutping gaan2 duk6
Pinyin jiǎn dú

Definitions (Wiktionary)
  1. noun, literary
    letters; correspondence
  2. noun, archaic, historical
    bamboo and wooden slips

簡牘 [简牍]

Jyutping
Pinyin jiǎn dú

Definitions (CC-CEDICT)
  1. bamboo and wooden slips (used for writing on in ancient times)
  2. letter; correspondence; book; document
Examples (粵典–words.hk)
  1. Cantonese
    简牍
    簡牘
    • letter,missive:a written message addressed to a person or organization
  2. Cantonese
    简牍
    簡牘
    gaan2 duk6
    • bamboo and wooden slips used for writing in the past