The symbol that resembles the letter “a” with two dots on top is commonly known as the “umlaut.” The umlaut is a diacritical mark that is used to modify the pronunciation of certain vowels in the German language.

In German, the umlaut changes the sound of the vowel to a more fronted and higher sound. It indicates that a vowel sound is pronounced differently than it would be without the umlaut. For instance, the vowel “a” in German sounds like the “a” in “father,” but with an umlaut, the pronunciation changes to the “e” sound in “met.”
The umlaut is also utilized in other languages, such as Swedish, Finnish, and Hungarian, to modify the pronunciation of certain vowels. In these languages, it can indicate a change in vowel quality or a completely different vowel sound.
Apart from modifying vowel pronunciation, the umlaut is also used in German to differentiate between words that would otherwise have the same spelling. For instance, “uber” in German means “over,” whereas “über” with an umlaut means “about” or “concerning.”
The umlaut has a rich history and has been in use since ancient times in various forms. The umlaut evolved from a diacritical mark known as “dieresis” in Latin, which was used to indicate the separate pronunciation of two adjacent vowels, rather than as a diphthong.
Today, the umlaut is not only used in languages but also in other contexts like the names of businesses and brands. For instance, Mötley Crüe employs the umlaut in its name to create a unique identity and stand out.
In conclusion, the umlaut is a diacritical mark used to modify the pronunciation of certain vowels in German and other languages. It has a long history and is still used today in languages and other contexts as a means of creating uniqueness and distinguishing between words or meanings.