Yes or no: one value, or a field that is yes in some places and no in others.
The boolean as a bool field with the same value everywhere.
1 when true, 0 when false.
The boolean written as "true" or "false".
This yes/no in a Yes/No List of one.
Items that are each a Yes/No. One Yes/No wired where a list is taken counts as a list of one. A list wired where one Yes/No is taken runs the block once per item.