Is by definition a word of the same written form as another but of different meaning and usually origin, whether pronounced the same way or not. But in cyber-security this is expanded to include words that look the same. This can be achieved by using numbers that looks the same as a letter or characters from another characterset that look the same to humans, but computers see the difference. For example the letter Omicron from the Greek alphabet looks exactly the same as the “Latin” O, but they have a different code in the Unicode table.

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