Quadratic Equation on HP 41's.

[SlideRule]

√ is U+221A in the Arial, Consolas & Verdana fonts

WORD:
√ is U+221A in Insert, Symbol...;
√ is Insert... Object... Create... New Microsoft Equation;
√ is 221A, Alt+X shortcut key;

LaTex;

are some of the available options for √

BEST!
SlideRule