To form into an acronym.
An abbreviation formed by the beginning letters or syllables of other words (as "Benelux").
An abbreviation formed by the initial letters of other words, sometimes exclusively such abbreviations when pronounced as a word (as "laser") rather than as individual letters (initialisms such as "TNT").
To indicate interest in the communications made by a person or organization.
To sign up to have copies of a publication, such as a newspaper or a magazine, delivered for a period of time.
To agree to buy shares in a company.
To pay money to be a member of an organization.
To contribute or promise to contribute money to a common fund.
To believe or agree with a theory or an idea (used with to).
To pay for the provision of a service, such as Internet access or a cell phone plan.
To register for notifications about an event or similar.
To sign; to mark with one's signature as a token of consent or attestation.
To promise to give, by writing one's name with the amount.