Platform
Snowflake
Also called Discord ID, object ID
A Discord ID: a 64-bit integer that encodes the millisecond timestamp at which the object was created, so an account or message age can be read from the ID itself.
Every user, guild, channel, role and message on Discord carries a snowflake. Because the creation timestamp is encoded in the number, an ID alone tells you when the object was made without any API call — which is how alt-detection and account-age gates work.
The practical consequence for moderation: an account-age requirement can be enforced from the user ID before the account has done anything at all.