There are some similar characters in Unicode which are usually mistaken with each other because of keyboard layouts or something else.
The examples which I know are KAF (ك) and KEHEH (ک), Arabic Yeh (ي) / Alef Maksura (ى) and Farsi Yeh (ی). These characters should be taken under consideration with one who wants to write a web-base search engine for example. Google does not provide such a facility and so people usually can see about 50% of the result of a search on a keyword which contains an Arabic Yeh (which should be considered similar to Farsi Yeh sometime).
Is there any other similarities (mainly about Arabic letters) in other languages: e.g. Urdu.
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