提称语 is the 'opening honorific' of a Chinese letter, attached after the recipient's name. Examples:
钧鉴 (jūnjiàn) for officials,
尊鉴 (zūnjiàn) for elders,
台鉴 (táijiàn) for peers,
大鉴 (dàjiàn) more general. Mostly seen in formal or classical correspondence.