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In page Thaana:

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H. C. P. Bell, the first serious researcher of Maldivian documents,[citation needed] used the spelling Tāna, as the initial consonant is unaspirated. The spelling Thaana was adopted in the mid-1970s, when the government of the Maldives embarked on a short period of Romanization; /t/ was transcribed ⟨th⟩, as ⟨t⟩ was used for the voiceless retroflex plosive [ʈ].[1]: 565