need help with example in 'man procmailex'

The following example is given in 'man procmailex' approx line 164

:0 Whc: vacation.lock
               # Perform a quick check to see if the mail was addressed to us
              * $^To:.*\<$\LOGNAME\>
               # Don't reply to daemons and mailinglists
              * !^FROM_DAEMON
               # Mail loops are evil
              * !^X-Loop: your(_at_)own(_dot_)mail(_dot_)address
              | formail -rD 8192 vacation.cache

The question concerns the line

* $^To:.*\<$\LOGNAME\>

Why is there a "\" between the "$" and the "L" ?  I understand why the 
other "\" are needed.


thanks

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