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Use simple ‘codes’ in the post editor to insert romanized Arabic letters. The HTML entities for each symbol are inserted into the saved post, so no conversion is needed at display-time.
In the post editor, simply use the following ‘codes’ to have romanized latin characters inserted in place.
kit/aa/b
→ kitāb/cc/arab/ee/
→ ʿarabī/AA/jurr/oo/m/ee/yah
→ Ājurrūmīyah