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Type `' sqrt($) RET`.

If the `Q` key is broken, you could use `' $^0.5 RET`.
Or, RPN style, `0.5 ^`.

(Actually, ‘`$^1:2`’, using the fraction one-half as the power, is
a closer equivalent, since ‘`9^0.5`’ yields ‘`3.0`’ whereas
‘`sqrt(9)`’ and ‘`9^1:2`’ yield the exact integer ‘`3`’.)