Wow, it's like that time I saw someone else end an email with "Re**t**ards" instead of "Re**g**ards". While I've never done it, I admit I've sometimes thought about it, even prior to that case :)

More seriously though, as @GrayCygnus commented:

> B and N are **wayy** to close each other on Qwerty keyboards

which is true and also applies to letters `g` and `t` in my coworker's slip above.

I can say it was so *obvious* to me that it had been a typo, that I never even mentioned anything and never observed anyone even talking about it. People around me were _reasonable_ (and this is something I'll point out frequently). In fact, I'm not sure he's aware of his typo to this day :)

That said, just send a simple email apologizing; noting that it was typo should be enough for _reasonable_ people. Keep it short and simple.

> What approach could I take to apologize for my typo?

My suggestion is:

> Hi all,
> 
> I just realized I made a typo in my previous
> email and wanted to make a simple correction.
> 
> While context is clear, I meant to say that
> *[insert whatever here]* was Bigger.
> 
> 
> Thanks,
>
> [your name]

Make sure you send it to the exact same audience.

> Did I damage my professional image at my company?

I don't think so, if we can assume everyone is _reasonable_. Much less so if you send a simple apology noting that it was an unintended typo. Do not grow your simple typo into an incident of epic proportions.