Diacritical marks are glyphs (marks) added to an alphabetic letters to change pronunciation, as a syllable break, and/or meaning. It is a myth to think that English does not have diacritic marks - belovèd, café, éclair, façade, naïve, rôle are just a few of the words that have them. Diacritical marks are essential in many languages - their absence or presence changes meaning - and they should always be used.
In this example from Stockholm International Airport, the second character, which should be 達, has not been able to be reproduced with the software installed and has been replaced by a generic box symbol. This has not been noticed before the sign was erected.Practical International Data Management Online. A free resource from GRC Data Intelligence. For comments, questions or feedback: pidm@grcdi.nl