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American Standard Code for Information Interchange (ASCII) character sets
The succeeding table shows the mapping of the first 128 ASCII codes to character values. The left column digits are the leftmost digits of the ASCII code. The top row's digits represent the rightmost digits. For example, the ASCII code of character A would be 65.
ASCII was developed primarily for telegraph code. Bell labs brought out 7-bit teleprinter code for commercial promotion and official work on the ASCII code began on October 6, 1960.
Source: https://en.wikipedia.org/wiki/ASCII
Source: https://en.wikipedia.org/wiki/ASCII