hreflang="tk"

tk is a valid hreflang value for Turkmen.

Language: Turkmen (tk, ISO 639-1)

Example

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

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

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