Adobe InDesign CC 2015 - Manual (Page 202)

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Last updated 6/6/2015
If you have a mix of languages in the same paragraph, you can specify the direction of text at a character level. Also, to
insert dates or numbers, specify the direction of text at the character level.
From the Character panel menu, choose Character Direction and then select a direction.
Story direction
When you're working with Arabic and Hebrew languages, the story generally flows from the right to the left. The first
column must be on right side of the frame, and subsequent columns are added to the left. If your layout contains mixed
content, then different stories need a different direction.
From the Story panel (Window > Type & Tables > Story), click a story direction.