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As of 2019, Google and Facebook sign-in do not require users to share email addresses with the credential consumer. ' Sign in with Apple ' introduced in iOS 13 allows a user to request a unique relay email address each time the user signs up for a new service, thus reducing the likelihood of account linking by the credential consumer.

The at sign, @, is normally read aloud as "at"; it is also commonly called the at symbol, commercial at or address sign.It is used as an accounting and invoice abbreviation meaning "at a rate of" (e.g. 7 widgets @ £2 per widget = £14), but it is now seen more widely in email addresses and social media platform handles.

The symbol # is known variously in English-speaking regions as the number sign, hash, or pound sign. The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔.

Semiosis (from Ancient Greek σημείωσις (sēmeíōsis), from σημειῶ (sēmeiô) 'to mark'), or sign process, is any form of activity, conduct, or process that involves signs, including the production of meaning. A sign is anything that communicates a meaning, that is not the sign itself, to the interpreter of the sign.

Sign Language communication is a system of communication using visual gestures and signs, as used by deaf people. A unique property of Sign Language is that it is not easy to put on paper due to a lack of formal acceptance, and is impossible to be mediated over the phone or in a plain email.

Facebook page featuring British and Irish ghost signs Liverpool Ghost Signs - The first British ghost signs book Painted signs and mosaics - A record of ghost signs from the UK, France, Germany and a few other countries