This is a main category requiring frequent diffusion and maybe maintenance. As many pictures and media files as possible should be moved into appropriate subcategories.
These are used to mark “naql”, when there is a “hamza” after “tanween”; according to Warsh narration, the vowel of the “hamza” is moved to “tanween” so that it is pronounced as the letter “noon”:
Letters are displayed below in four contextual forms from right to left: isolated, initial, medial and final (for some letters, some form may be identical to another, notably isolated vs. initial, or medial vs. final). Forms can be specified selectively in plain text by prepending and/or appending a zero-with non-joiner (ZWNJ, U+200C) or zero-with joiner (ZWJ, U+200D), in order to override their default joining behavior (this is recommended instead of using legacy compatibility characters encoded in the Arabic Presentation Forms-A and Arabic Presentation Forms-B blocks, only for some basic Arabic letters).
See also categories: Unicode 0600-06FF Arabic, Unicode 0750-077F Arabic Supplement, Unicode 08A0-08FF Arabic Extended-A and Unicode 0870-089F Arabic Extended-B.
UCB Arabic Extended-C.png 1,900 × 520; 43 KB