The centre bar of the upper-case 'P' leaves a gap with the vertical.
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The upper-case 'G' has a bar to the left.
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The upper-case 'I' is a stroke with a flourish on top - not closed.
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The upper-case letter 'O' has a discontinuity or gap.
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Note that the fonts in the icons shown above represent general examples, not necessarily the two fonts chosen for comparison.
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