WTF is a civic hx??

i was driving the other day and i see a civic hx and i thought i was tripping because i have never heard of an hx. the first one i saw i was like "well they probably changed it or something" but then my sisters and i see it again and we're like huh??? i know there's dx,lx,and ex but hx?? am i the only one who has never heard of or seen this before or am i really crazy?