A passenger ship is a merchant ship whose primary function is to carry passengers on the sea. The category does not include cargo vessels which have accommodations for limited numbers of passengers, such as the ubiquitous twelve-passenger freighters once common on the seas in which the transport of passengers is secondary to the carriage of freight.

In cryptography, a public key certificate, also known as a digital certificate or identity certificate, is an electronic document used to prove the validity of a public key. The certificate includes information about the key, information about the identity of its owner (called the subject), and the digital signature of an entity that has verified the certificate's contents (called the issuer).

<communications, security> An attachment to an {electronic mail} message used for security purposes, e.g. to verify that a user sending a message is who he or she claims to be, and to provide the receiver with the means to encode a reply. An individual wishing to send an encrypted message applies for a digital certificate from a certificate authority (CA). The CA issues an encrypted digital certificate containing the applicant's public key and a variety of other identification information. The CA makes its own public key readily available on the Internet. The recipient of an encrypted message uses the CA's public key to decode the digital certificate attached to the message, verifies it as issued by the CA and then obtains the sender's public key and identification information held within the certificate. (2006-05-27)

A standard certificate of airworthiness is a permit for commercial passenger or cargo operation, issued for an aircraft by the civil aviation authority in the state/nation in which the aircraft is registered. For other aircraft such as crop-sprayers, a Special Airworthiness Certificate (not for commercial passenger or cargo operations) must be issued.

The New Zealand School Certificate or School Certificate was an examination-based New Zealand secondary-school qualification for high-school students in Year 11 (Form 5) from the 1940s until 2002.

A marriage certificate (sometimes: marriage lines) is an official statement that two people are married. In most jurisdictions, a marriage certificate is issued by a government official only after the civil registration of the marriage.

A certificate of attendance (also certificate of participation or certificate of completion) is an official document proving the attendance of a class, a language course or a training course.

n. printed document which states the name, incorporation state, date of incorporation, the registered number of the certificate, the number of shares of stock in a corporation the certificate represents, the name of the shareholder, the date of issuance and the number of shares authorized in the particular issue of stock, signed by the president and secretary of the corporation (or with facsimile signatures). On the reverse side of the certificate is a form for transfer of the certificate to another person. After transfer the new owner should register the change of ownership with the corporation. See also: corporation share stock

In corporate law, a stock certificate (also known as certificate of stock or share certificate) is a legal document that certifies the legal interest (a bundle of several legal rights) of ownership of a specific number of shares (or, under Article 8 of the Uniform Commercial Code, a securities entitlement or pro rata share of a fungible bulk) or stock in a corporation.

A passenger service system (PSS) is a series of critical systems used by airlines. The PSS usually comprises an airline reservations system, an airline inventory system and a departure control system (DCS).