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\settoheightSynopsis:
\settoheight{len}{text}
Sets the length len to the height of box that LaTeX gets on
typesetting the text argument. The length name len must
begin with a backslash, \.
This will show how high the characters go.
\newlength{\alphabetheight}
\settoheight{\alphabetheight}{abcdefghijklmnopqrstuvwxyz}
\the\alphabetheight
If no such length len has been declared with \newlength, if
for example you mistype as
\settoheight{\aplhabetheight}{abc...}, then you get something
like ‘Undefined control sequence. <argument> \alphabetheight’. If
you leave the backslash out of len, as in
\settoheight{alphabetheight}{...} then you get something like
‘Missing number, treated as zero. <to be read again> \setbox’.