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An inverted blue triangle carrying a route number.
Also known as: Onigiri sign, Japanese route shield
Identifies a Japanese national highway by number, in a shield whose shape gives it its nickname.
Identifies a national highway route by its number.
Contexts: Road signage
Is universally nicknamed the onigiri after the rounded triangular rice ball it resembles, a nickname that appears in ordinary speech and in road-industry usage rather than only in slang.
Contexts: Road signage
A triangle stood on its point with rounded corners, carrying a numeral across its middle above the word for national route.
The prefectural tier of the same numbering system.