удостоверение

1) General subject: ascertainment, card, certificate, certification, chit, corroboration, ticket, verification (регистрации ценных бумаг), authorization document (similar to a warrant, but a warrant is only issued by a court, an удостоверение issued by another authority would be an authorization document)

2) Military: permit

3) Engineering: authenticator (мера защиты от несанкционированного доступа), licence (о наличии определённых прав), license (о наличии определённых прав)

4) Religion: averment

5) Law: attestation, authentication, testimonial, verification, voucher (факта), warrant

6) Diplomatic term: identity document

7) Polygraphy: ticket (виды печатной продукции)

8) Politics: (наблюдателя на выборах и т.д.) accreditation

9) Information technology: authenticator (напр. кодовое число, защищающее сообщение от несанкционированного изменения), authentificator

10) Oil: wax

11) Official expression: Certificate of Authorization (issued to individuals and business entities to work in a province or a certain industry)

12) Advertising: identity paper, testimonial letter

13) Education: qualifications

14) American English: credentials (or creds for short)

15) EBRD: acknowledgement, acknowledgement certificate, certification (факта)

16) leg.N.P. acknowledgment

17) Makarov: chitty, qualification, whom it may concern (заголовок справки, удостоверения и т.п.)

18) Microsoft: identity