hreflang="sd"

sd is a valid hreflang value for Sindhi.

Language: Sindhi (sd, ISO 639-1)

Example

<link rel="alternate" hreflang="sd" href="https://example.com/sd/" />

The code is case-insensitive for Google. The conventional spelling is a lowercase language, a title-case script and an uppercase region: sd.

Without a region, the annotation targets every Sindhi speaker regardless of country. Regional versions sit next to the language-only version in one cluster.