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Significance of alphabets in IC number

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what is the significance of an ic number

Please tell me what does the IC no represent? I mean, for example, we have 7400 as quad two input positive nand gate,but what does the alphabetical symbols apart from 7400 eg DM 74LS00 , or SN74LS139A orSN74L139A signifies?
Please help. It's urgent....

Another question, why does JK flip flop called so?

These are the expected question in my viva tom. so please help..........
 

the letters in the name of an IC signifies the various other parameters than just functionality.. I cant just explain each alphabet and say what it is but the differences in the 1 or 2 alphabets may change its entire application area though functionality is same.. like the operating temp(cold, normal, hot) working conditions (ordinary/domestic, industry, military) etc.,
 

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