motherboard slots explained: pcie-slots. What are the Northern Lights? And how can you see them? - BBC News. D&D 5E - Short Rest Spellcasters (+).
PCIe (Peripheral Component Interconnect Express)
slots on a motherboard are used to connect various internal components, primarily expansion cards, to the motherboard.
The fantastic night-sky light display explained.
Wizard
Spell Slots in 5e D&D explained + how spellbooks work + roleplaying tips. Scroll on spell slingers!