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"Sol Key" (G-clef) is related to the goal of branding Rosh HaAyin as the "city of music". In addition to the mark that appears on the house numbers, sculptures of musical instruments were placed in the city squares, for example the harp placed in the square at 24 Rabbi Shalom Shabazi Street, Rosh HaAyin, Israel, photographed in 2021 Click for a larger image
As part of the branding of the city, a symbol for the city was added, which includes the original city symbol, and next to it the inscription "A city with music in the heart" as can be seen in symbol Click for a larger image that appears on one of the heritage signs in the city Click for sign's details

Notice this format and that of the street signs in that city Click for sign's details

The sign is similar to other house number signs Click for sign's details, Click for sign's details, Click for sign's details, Click for sign's details