Mercury Intermedia, in a post on Medium, shares its extensive documentation of Apple Maps’ iconography over the years:

A few years ago we published a post examining the point of interest (POI) icons within Apple Maps titled More Than You Ever Wanted to Know About Apple’s Spotlight Location Icons. POI icons have existed in Apple Maps since Google was the maps provider. But with iOS 6, Apple took full ownership of Maps and introduced a selectable, color-coded POI system with all new iconography.

We took particular notice of the icons included with iOS 8 when Apple began using larger versions of these icons at the system level as part of their new Spotlight search feature. Apple has continued to iterate on these icons and has made several additions and refinements. With iOS 10 for example, Apple redesigned the Maps app to use the larger POI icon set directly on the map itself. This post will examine how the system has grown and evolved over the past few years.

If you’re interested in design, iconography, or how these things have evolved over time in Apple Maps, the post is a fantastic resource and fun exploration of the little details that make a significant mark on user experience. For example, the article includes quotes from designer Scott Dunlap comparing Apple’s icon changes over the years and what purpose those tweaks served, as well as offering feedback for how Maps’ icon set could stand more improvement, particularly for greater clarity at small sizes.