Passage: Documents in Kaithi are traceable to at least the 16th century. The script was widely used during the Mughal period. In the 1880s, during the British Raj, the script was recognized as the official script of the law courts of Bihar. Kaithi was the most widely used script of North India west of Bengal. In 1854, 77,368 school primers were in Kaithi script, as compared to 25,151 in Devanagari and 24,302 in Mahajani. Among the three scripts widely used in the Hindi Belt, Kaithi was widely perceived to be neutral, as it was used by both Hindus and Muslims alike for day-to-day correspondence, financial, and administrative activities, while Devanagari was used by Hindus and Persian script by Muslims for religious literature and education. This made Kaithi increasingly unfavorable to the more conservative and religiously inclined members of society who insisted on Devanagari-based and Persian-based transcription of Hindi dialects. As a result of their influence and due to the wide availability of Devanagari type as opposed to the incredibly large variability of Kaithi, Devanagari was promoted, particularly in the Northwest Provinces, which covers present-day Uttar Pradesh. Kaithi was also nicknamed "Shikasta Nagari" due to its relationship with Devanagari being akin to the relationship between the widely used dot-less Shikasta Nastaliq of the time and the more formal and fully expressive printed Nastaliq scripts.

Question: During which period was the script called Kaithi widely used?
Mughal period