'Publication' and 'Global' Styles
When creating or editing the properties of a Style, there are two 'Scopes' of Styles available - "Publication", and "Global".
A 'Publication style' is a style that's unique to that one publication, and will only be available to articles within that publication.
This is the default style and the most commonly used, as each publication will usually have entirely unique branding.
A 'Global style' is a style that's available to every publication on the account.
This is useful for publications that share branding, for example publications that are the same brand but separated by into different language translations.