Modern English
Modern English (sometimes New English or NE as opposed to Middle English and Old English) is the form of the English language spoken since the Great Vowel Shift in England, which began in the late 14th century and was completed in roughly 1550.
Chakma alphabet
The Chakma alphabet is probably descended from Brahmi through Pallava. Proto Chakma developed around the 6th century CE. Old Chakma developed in the 8th century CE. Classical Literary Chakma was used in the 11th to 15th centuries and the current Standard Chakma was developed and revived in the 20th century.