Establishing our approach to icons

Related to [meta] Evolving the GitLab Visual Personality

Today we use Font Awesome for our icons. There have been some discussions about whether these icons match the personality we want for GitLab.

• Are there other icon packs that match our personality better?
• Is there an icon style we can point at (such as iOS or Material) that fits better?
• Do our icons render well at the sizes we want them to render out?