In fonts with text figures, digit 2 usually is of x-height, for example. Restoring the bottom line to its original horizontal position, but keeping the top line as a curve that connects to the bottom line leads to our modern digit. In the Arabic Ghubar writing, the bottom line was completely vertical, and the digit looked like a dotless closing question mark. In the Nagari script, the top line was written more like a curve connecting to the bottom line. The top line was sometimes also shortened and had its bottom end curve towards the center of the bottom line. The Gupta script rotated the two lines 45 degrees, making them diagonal. The modern Chinese and Japanese languages still use this method. The digit used in the modern Western world to represent the number 2 traces its roots back to the Indic Brahmic script, where "2" was written as two horizontal lines.
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