noun, noun which may take the genitive case particle 'no'
left (in vertical writing); the following
Used in vertical Japanese writing to refer to the text that follows (which appears to the left of the current position). In horizontal writing, 下 (した) is used instead.
詳細は左の通りです。
Details are as follows (in vertical writing).
左に記した住所までご連絡ください。
Please contact us at the address indicated below (in vertical writing).
下 (した) is used in horizontal writing to mean 'below' or 'the following', whereas 左 (さ) is specific to vertical writing.
The kanji 左 means 'left'. The reading さ is a native Japanese reading (kun'yomi) used in this specific context of vertical writing.