My wife's laptop has three USB-C ports and the laptop charges off all 3, but only one has the bolt. I strongly suspect it means Thunderbolt support, i.e. it's t

My wife's laptop has three USB-C ports and the laptop charges off all 3, but only one has the bolt. I strongly suspect it means Thunderbolt support, i.e. it's the only port that will work well with a dock.