Currently (in 0.98.5952), in English UI, the following items haven't tooltips:
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range(#,#)
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range(#,#,#)
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exp(#)
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perc(#,#) - it this required at all, given that we have '% unit now?
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try(#;#)
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all greeks - but this isn't required (though might help learning their names).