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I know its probably been answered before, but I'm not really sure what to google to find the answer.

enter image description here

share|improve this question
    
It's a mechanical outline drawing of an IC. – John D 6 hours ago
4  
Probably OP wants to ask about the symbol marked in red rectangle. – Whiskeyjack 6 hours ago
    
I'm not sure what you mean. That looks like numerical data to me.... I'm talking about the stuff in the red box fyi – James Oldiges 6 hours ago
1  
Sorry, I misunderstood the question. – John D 6 hours ago
    
Could be this one: gdandtbasics.com/maximum-material-condition – Mario 6 hours ago
up vote 9 down vote accepted

It indicates position tolerance in inches and (mm).

More info on this pdf.

enter image description here

As comments in the question and this answer point out, the "M" in a circle stand for "Maximum Material Condition", as in largest pin width or smallest hole.

enter image description here

share|improve this answer
    
Just found this doc too :) Well, you win. – Eugene Sh. 6 hours ago
1  
The (M) is described a few pages later - it's the "maximum material condition". – duskwuff 6 hours ago
    
@EugeneSh. - well, its the first result on google-fu. – Wesley Lee 6 hours ago
    
@duskwuff - thanks, I'll add the info on the answer – Wesley Lee 6 hours ago

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