Notice the circle around the "kt". It's a circle with a varying stroke. At one point, it even thins out and becomes absent.
How do I achieve a stroke like this in Illustrator?
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There are probably many ways this could be done. Others have mentioned the width tool, a predefined brush, using two circles, etc. Another method is to make a custom Art Brush yourself.
With the Pen tool, draw a shape like this:
Then click and drag it into the Brushes panel, and choose the option to make an Art Brush.
Next, draw a circle, add an anchor point at about the 1 o'clock position, and delete a small section of the circle.
Apply the brush you made previously, and reduce the stroke width.
It's even possible to make an Art Brush with a bit of a bump to create something that looks a bit like a brush stroke.
It's hard to see how this was achieved exactly dus to the low resolution of the image, but there is a couple ways to get a similar effect.
Less exact control, more natural-looking effect.
More control, cleaner and more clinical effect
You can add more width points as needed, and using Alt / Option while click-dragging, affect the width of the stroke on either site of the path individually.
Have 2 filled circles with slightly different diameters. Subtract (=Pathfinder panel minus) the smaller from the bigger:
Stretching one of the circles a little to make it elliptic creates more variation possibilities:
But technically these are not strokes, they are filled paths. If that's a problem do as already suggested by others: use stroke width tool or an artistic brush.