Digital Jawi Paleography is a field of research that helps paleographers to identify authors, origin and date of Jawi manuscripts. This research is important because of the existence of a huge amount of Malay manuscripts with unidentified authors, origin and date. Most researches in the area are for Roman and Hebrew text, whereas researches for Jawi text have just begun recently. In this paper, a novel technique is proposed in order to identify types of Arabic calligraphy in Malay ancient manuscripts that were written in Jawi. The novel technique is based on the triangle blocks that were adapted from scalene triangle. Twenty-one features have been extracted from the triangle blocks.