This is Yokosuka City's offical emblem.
The center of the harmoniously designed City emblem incorporates the first letters of the city name "Yo-ko" (using katakana characters: ヨ/yo and コ/ko -- note: the ko is reversed)/
The Yo-ko characters are stylistically combined in a circular shape inspired by the ancient Miura clan's "Mitsuhiki/3-Lines" family crest.
The surrounding 8-pointed star is meant to depict a navigational compass for ships and symbolizes Yokosuka's role as an important port city.
This City emblem was established on March 16, 1912, during the 45th year of the Meiji era.