Explosions In The Sky...song title confusion?!

Is the song by "Explosions In The Sky" actually called "Your Hand IS Mine" or "Your Hand IN Mine"!.!.!.cuz i thought at first that it was called "Your Hand IS Mine" and although i couldnt quite understand why, i just assumed it was an artistic title!.!.!.but i often notice some people tend to write it as "Your Hand IN Mine"!.!.!.so im confused, what is the actual title of this song!?!?

And in the case, that it turns out actually to be "Your Hand IS Mine"!.!.!.why is it called that!?!?Www@Enter-QA@Com

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