I-Beam
You may already be familiar with the Macintosh word processing I-beam (pronounced eye-beam). It looks like this (or very similar):
The tiny crossbar just below the center of the I-beam indicates the “baseline” of type, that invisible line that type sits upon.
On the Mac, the I-beam is a visual clue that you are now in a typing mode, as opposed to seeing an arrow or a cross-hair or any number of other “cursors” that appear in various applications.
The I-beam is simply another pointer. And just like the pointer, it doesn’t do anything until you click it or press-and-drag it.
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