[Tom Krehbiehl] shared the following interesting code in the [Tcl chatroom], which may display a large E in various rotation angles:

 proc rotmatrix {size angle} {
    set size [expr {double($size)}]
    set angle [expr {double($angle)*acos(0.0)/90.0}]; # In radians
    set c [expr {$size*cos($angle)}]
    set s [expr {$size*sin($angle)}]
    # Due to Tk's XLFD (X Logical Font Description)
    # parser, we need to round values
    set s [format "\[%.f %.f %.f %.f\]" $c [expr {-$s}] $s $c]
    regsub -all -- "-" $s ~ s
    return $s
 }
 pack [scrollbar .vs -orient vertical -command {.c yview}] -side right -fill y
 pack [scrollbar .hs -orient horizontal -command {.c xview}] -side bottom -fill x
 pack [canvas .c -bg white -xscrollcommand {.hs set} -yscrollcommand {.vs set}]\
        -side left -expand 1 -fill both
 set nb 16
 set size 24
 set size 64
 set text "The Quick Brown Fox jumps over the Lazy Black Dog"
 set text "E"
 .c configure -scrollregion [list -1000 0 1000 [expr {$size*$nb*2}]]
 set x 100
 for {set i 0} {$i < 16} {incr i} {
    set y [expr {10+$i*$size*2}]
    set angle [expr {360.0*$i/$nb}]
    .c create text $x $y -text [format "%.1f�    " $angle] -anchor ne -font \
       -adobe-times-medium-r-*-*-$size-*-*-*-*-*-*-*
    .c create text $x $y -text $text -anchor nw -font \
       -adobe-times-medium-r-*-*-[rotmatrix $size $angle]-*-*-*-*-*-*-*
    .c create rectangle [expr {$x-2}] [expr {$y-2}] [expr {$x+2}] [expr {$y+2}]\
       -outline black -fill red
 }

suchenwi	WOW! YES!

tomk	I added the 64 font size and the text "E". If you remove them you get a string version.

kennykb	Guys: Before you get too excited, this is Unix-only and not supported by every X server.

suchenwi	Works here on Solaris via Reflection, but not native on PC - there the E is only scaled smaller. But it's definitely only recommendable for a single letter...

bschwarz	doesn't work on linux 

kennykb	The functionality is X, mostly. The comment about Tk's XLFD parser has to do with whether Tk will recognize the string as an XLFD or a Tk font name.