some defines I couldnt understand '_IOC_NONE 1U'

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Subject: some defines I couldnt understand '_IOC_NONE 1U'
From: Daniel Redway <daniel.redway85@xxxxxxxxx>
Date: Sat, 18 Jun 2011 18:39:45 +0300

Hello

I dont understand what means 'U' character. I found this defines in asm/ioctl.h file.
Thanks

#define _IOC_NONE 1U
#define _IOC_READ 2U
#define _IOC_WRITE 4U

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