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Uthmani Minimal is a variant of Uthmani text from which extra diacritics and non-necessary symbols are removed. This text has arguably the minimum number of diacritics and symbols needed to read quran correctly. While the script of this text is exactly the same as the Uthmani text, this text has on average 175 diacritics/symbols per page less than its equivalent in Madina Mushaf which makes it pretty cleaner and easier to read.
The unnecessary diacritics and symbols removed from Uthmani text to reach this minimal text are as follows:
أُand lam are non-read.
جِاْيءَ, the small circle is kept to indicate that the letter is extra.