written request form; written inquiry
A formal written document used to make a request or inquiry, often in business or official contexts.
I submitted a written request for leave to the company.
Compound of 伺い (うかがい, 'inquiry' or 'visit', from 伺う) and 書 (しょ, 'document'). The exact historical derivation is uncertain; the spelling is conventionally associated with a formal written request.