Adobe Illustrator CC 2015 - Manual (Page 396)

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Type
Last updated 6/5/2015
Ligatures
You can automatically apply ligatures to character pairs in Arabic and Hebrew. Ligatures are typographic replacement
characters for certain letter pairs if they are available in a given Open Type font.
When you choose Ligatures from the Character panel menu or Control panel menu, a standard ligature defined in the
font is produced.
1 Select text.
2 Choose Ligatures from the Character panel menu or the Control panel menu.
However, some Open Type fonts include more ornate, optional ligatures, which can be produced when you choose
Discretionary Ligatures. These ligatures are found at Character panel > OpenType > Discretionary Ligatures.