I know its probably been answered before, but I'm not really sure what to google to find the answer.
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It's a mechanical outline drawing of an IC. – John D Jul 29 '16 at 17:04
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5Probably OP wants to ask about the symbol marked in red rectangle. – Whiskeyjack Jul 29 '16 at 17:05
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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 Jul 29 '16 at 17:05
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1Sorry, I misunderstood the question. – John D Jul 29 '16 at 17:08
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Could be this one: http://www.gdandtbasics.com/maximum-material-condition/ – Mario Jul 29 '16 at 17:08
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It indicates position tolerance in inches and (mm).
More info on this pdf.
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.
Wesley Lee
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2The (M) is described a few pages later - it's the "maximum material condition". – Jul 29 '16 at 17:10
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Which is a Drawing layout for the Machining, with the GD&T positioning tolerance The position tolerance M symbol represents Maximum material condition If there is L symbol That represents Least Material Condition.
Sundar
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