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From October 2019 ASRS CALLBACK, a captain told a story when the dispatcher

told me, “All the ‘T’s had been crossed, and all the ‘I’s had been dotted: everything has been done the right way, routine... etc.”

What is the ‘T’ and the ‘I’ mean in this sentence? What is their significance?

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    $\begingroup$ It's referencing an idiom. Or are you asking about what the dispatcher would have actually done? $\endgroup$ – fooot♦ Oct 24 '19 at 17:43
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    $\begingroup$ Hah it is English word, not aviation specific. Yes this is the answer I want. So the dispatcher means he alr do every thing needed for the flight. Thx a lot $\endgroup$ – vasin1987 Oct 24 '19 at 17:46
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This would probably be better suited for English, as it's a phrase that really has nothing to do specifically with aviation. However...

Having dotted your "I"s and crossed your "T's means that you've paid attention to all the details, that you've finished everything that needs to be done, the job is complete.

An uncrossed "T" could be a capital "I" or a lower-case "L". An undotted "I" could be a lower-case "R" or "E". These are especially true of hand-written, cursive letters. So crossing your "T" ensures clarity and completes the job.

When the dispatcher said this to the captain, he was telling him that he'd gone over all the details and the job was done.

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