Currently it has a bunch of stuff we don't use and probably never will, hence T139779: Kill badgeicons.json and use OOUI's icons-alerts.json instead exists. :-(
- “Signature”
- Deprecated to be moved to 'editing-advanced' in v0.23.0
- Removed from 'alerts' pack
- “Eye”/“EyeClosed”
- Deprecated to be moved to 'accessibility' in v0.23.0
- Removed from 'alerts' pack
- “bellOn”
- Deprecated to be removed in v0.26.0: b67216f7330cad43f4a3b921e67320672ed82b34
- Removed from 'alerts' pack: https://gerrit.wikimedia.org/r/406610