Unofficial set symbols
We've received some requests for icons representing sets or collections of cards that have no official symbol or set code. I'm going to list them here and perhaps include a new section in the repo for "Unofficial symbols" that, while not ever used by Wizards and would need to be "custom," could be helpful for projects that need some way of uniquely distinguishing these cards.

[Editing this to be a checklist with update:]

- [x] **Collector's Edition** &mdash; blank core set icon with CE on it
- [x]  **International Collector's Edition** &mdash; blank core set icon with IE on it
- [x]  **Revised FBB / FWB** &mdash; kicking this, I don't think they need their own set symbols and agree with @csuhta on the use case
- [x]  **4th Edition Alternate** &mdash; while this is the same as above and I don't think this needs an alternate icon (they're still "4th Edition"), I'm going to make a 4th edition icon with an asterix for now and see if it's usable
- [x]  **Introductory Two-Player Set** &mdash; this seems extremely minor to create an icon for but "2PS" stylized the same way as MPS will work here
- [x]  **Pro Tour and World Cup** &mdash; these already have correct symbols in `pmei` and `parl` depending on the year
- [x]  **APAC and Euro lands** &mdash; still investigating
- [x]  **Anthologies** &mdash; this already has an icon in Keyrune
- [x]  **Judge Rewards** &mdash; see Pro Tour and World Cup, icons exist