(Pages, iWork) Defining a space between some characters

Solution 1:

For this, a NARROW NO-BREAK SPACE is probably a good choice. Open the Character Picker and search for NARROW NO-BREAK SPACE. Since it's a space, it won't be really visible so you need to click into the results space, hoping to find it (see the greenish area in the screenshot). Then double-click to insert.

Character Picker with Narrow No-Break Space