Bizarrely I did found a lot "small pockets" around me, quite a notable proportion, prefer a smaller phone.
So from your link, it looks like Liquidmetal with a capital "L" and no space is a trademark for some alloys with interesting properties that Apple has bought exclusive rights to use in phones. It's the "journalists" that are translating Turing Robotics' similar sounding trademark Liquidmorphium into "liquid metal".