They're referred to as Glint+. The visible difference is the icon - traditional Glints have a green spark icon, while a Glint+ will have a blue spark. Unlike a Glint, a Glint+ can only be used once, but it costs no SB gauge to use and typically triggers instantly. This makes them useful either as openers or sudden bursts. Most are openers, as they include En-Element or Imperil, a ProShellHastega suite, or instant SB gauge charge. Then you have those like Cinque's that deal Overflow damage, making them an effective way to mitigate a Magicite's elemental rage.