What is nameIndex?

In the docs we have this example:

export const countries = pgTable('countries', {
  id: serial('id').primaryKey(),
  name: varchar('name', { length: 256 }),
}, (countries) => {
  return {
    nameIndex: uniqueIndex('name_idx').on(countries.name),
  }
});


What does
nameIndex
mean here? Is it a random text or it actually means something?

Also, let's say we have another column called
chineseName
for example. If an app can search using a where statement with the
name
columns and, on another query, use a where clause with the
chineseName
, how should we treat indices?

Thank you
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