; // America/Los_Angeles

The uniquely identifying name of the time zone. See the IANA Time Zone database naming guidelines for more details about the naming convention.

Note that the guidelines also say that these zone identifiers shouldn't be displayed directly to end users:

Inexperienced users are not expected to select these names unaided. Distributors should provide documentation and/or a simple selection interface that explains each name via a map or via descriptive text like "Czech Republic" instead of the timezone name "Europe/Prague".

Providing a full list of translated zone names for every locale is outside the scope of Moment Timezone. The Unicode CLDR project contains locale-aware mappings for this purpose.