These are now called "Monograms".
| Prefix | Object |
|--------|--------|
| A | |
| B | Buildable (Harbormaster) |
| C | Countdown |
| D | Revision (Differential) |
| E | Thread (Conpherence), soon Event (Calendar) |
| F | File |
| G | |
| H | Herald Rule |
| I | Initiative (Fund) |
| J | |
| K | Key (Passphrase) |
| L | Document (Legalpad) |
| M | Mock (Pholio) |
| N | Nuance Item |
| O | |
| P | Paste |
| Q | Question |
| R | Commit/Repository |
| S | Spaces |
| T | Task (Maniphest) |
| U | Phurl URL |
| V | Vote (Slowvote) |
| W | Widget (Dashboard) |
| X | |
| Y | Releeph Request |
| Z | Probably Conpherence after "E" moves? |
| @ | User |
| # | Project |