Naha [Okinawa prefecture Japan]

According to Regulations and Rules of Naha City the Naha flag was adopted on 1 September 1965.

Color of field: blue
Color of Emblem: white
Proportion: 2:3
Placement of Emblem: centered
Size of Emblem: 7/10 of height

On 19 December 1921,the Emblem of Naha city was adopted.
Miru Takano, 18 October 2005

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The city symbol represents a stylized version of the first character of Naha (ナ), on a blue field. The circular design appears to represent the unlimited potential of the city.
Phil Nelson, 30 October 2005

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Adoption date of emblem: Dec 19 1921 by Notice No 38; a stylized katakana Naha ナハ; diameter of the emblem: 7/10 flag height
Nozomi Kariyasu, 20 February 2006

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The emblem consists of the katakana na ナ forming a circular shape with a vertical line and the katakana ha ハ forming two halves of a circle inside the larger one. As noted above, according to the website (not the notice from 1921) the circular stylised characters express infinite growth/development of Naha City (那覇市 Naha-shi).
Jonathan Dixon, 18 May 2006