Messrs.; for the attention of; ... and Company
A formal suffix used after the name of an organization or company in the address block of a letter or email, similar to 'Messrs.' or 'Attn:' in English. Not used for individuals.
Please address it to 'XYZ Corporation, Messrs.'
Write 'To the Attention of XX University' on the envelope.
To Yamada Trading Co., Ltd. (Attn:)