The most memorable estimation technique I came across when I started out as a software engineer was "two days or less?".

Our team would simply gather around, go through the tasks that were agreed with the business and on count of three, each of us simply raise a thumbs up if we thought we could ship it within two days - otherwise thumbs down.

It generally implied we collectively thought a task would take more than two days to ship, it may require breaking down, otherwise it’s good to go.