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If I understand correctly, that’s what’s called a cliff - during the first period of your grant, you have no ongoing vesting, until a set date in the future where all of that period vests at once.
For example, first 12 months: 0%, then 12/48 at once, and finally 1/48 every month for the remainder of the grant.
Correct me if I misunderstood.
Aha! Sounds like a combination of a cliff (but not quite if the grant is just not given until 1 year) and continuous refreshers.