Roam Research's Δ feature (spaced repetition)

ref: https://www.cortexfutura.com/preliminary-spaced-repetition-roam/

Basically it lets you schedule a thing to re-appear in your daily notes at an interval:

{{[∆](∆.md):1+2}}

This means "make this page re-appear in 1 day, then increase the first number by 2"

It'll increase like this:

• 1 day
• 3 days (+2)
• 5 days (+2)
• 8 days (+2)
• 10 days (+2)

This is useful for spaced repetition