サンダー16 [thunder 16] in Japanese. This is a reference to Final Fantasy II, where each spell had numbered levels instead of the -ra -ga system. The highest level a spell could reach was 16.
Record Keeper

Type: Soul Break, Rarity: -
Target: all enemies, Element: Lightning, Gauge cost: 1 bar
Learn: Maria (equip Artemis Bow (II))
Effect: Deals a strong fourfold Lightning-element magical attack on all enemies, and raises the magic power of all allies for a set period of time
Pictlogica
Type: Premium Skill, Memento: Wisdom, Speed: Fast
Target: all enemies, Element: Magical / Lightning, Power: 800
Learn: Leila
Learn cost: Emerald x3, Memoria Prime, Soul of a Hero, 30,000 gil
Description: Deals small magical damage to all enemies. Lightning element.
Category: Ability