ICCPROFILECLASS

typedef enum
{
    InputClass = 0x73636E72L, /* 'scnr' */
    DisplayClass = 0x6D6E7472L, /* 'mntr' */
    OutputClass = 0x70727472L, /* 'prtr' */
    DeviceLinkClass = 0x6C696E6BL, /* 'link' */
    AbstractClass = 0x61627374L, /* 'abst' */
    ColorSpaceClass = 0x73706163L, /* 'spac' */
    NamedColorClass = 0x6E6D636CL  /* 'nmcl' */
} ICCPROFILECLASS; 

This enumerated type is used within the ICC_HEADER structure to indicate the profile class.