It's a phone brand. But I think that when the creators were naming the company, they wanted to call it THC ( Tetrahydrocannabinol) but they were too stoned, so failed at spelling
A: MAAAAAN!!!! I Love Mary Jaaanee!!! Let's call the phone company THC!!
...Too stoned to write it properly...
A: Damn, I wrote HTC! Whatever... Can't be fucked to change.
B: Yee, too much work