Working with lists with numerical names

Greetings!

I'm have a hard time working with some data I imported from a baseball
database.  Several of the database columns have numbers in them (2B,
3B), and when I try to use these vectors from the data frame, I get
syntax errors, probably because it's interpreting the name as a number:

 > show(batting2005)

   playerID yearID stint teamID lgID   G  AB   R   H 2B 3B HR RBI SB CS  BB
   1   robleos01   2005     1    LAN   NL 110 364  44  99 18  1  5 34  0  8  31
   2   iguchta01   2005     1    CHA   AL 135 511  74 142 25  6 15 71 15  5  47
   3   molinya01   2005     1    SLN   NL 114 385  36  97 15  1  8 49  2  3  23
   . . .

 > print(batting2005$HR)

   [1]  5 15  8  3 14  3  6 21  8  7  9 27 12  5 14  8 28  9 22 15  5
   22  9 10  1
   . . .

 > print(batting2005$2B)

 Error: syntax error in "print(batting2005$2"

 > SLG<-(H + 2B + 3B * 2 + HR * 3) / AB;

 Error: syntax error in "SLG<-(H + 2B"      # batting2005 is attached

 > SLG<-(H + "2B" + "3B" * 2 + HR * 3) / AB;

 Error in H + "2B" : non-numeric argument to binary operator

Is there a way to "escape" the '2B' somehow or encapsulate it so that R
knows I'm talking about that particular numeric vector?

Thanks,

Chris