The '$' (dollar) has a single line which does not cross the 'S'.
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The '&' (ampersand) looks like 'Et' with a gap at the top.
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The lower-case 'g' is single-storey (with or without loop).
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The upper-case 'U' has a stem/serif.
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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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