The letters in Patek Philippe caliber numbers signify the complications and functions of the movement.
| Movement Code | French Word(s) | Complication/Function (in English) | Case Material |
|---|---|---|---|
| 10J | 10 jours | 10-day power reserve | Yellow Gold |
| 24H | 24 heures | 24-hour dial | White Gold |
| AL | Alarme | Alarm | Pink Gold |
| C | Calendrier | Date indicator | Stainless Steel |
| CH | Chronographe | Chronograph | Platinum |
| CHR | Chronographe à rattrapante | Split seconds chronograph | Titanium |
| CL | Ciel | Sky chart | |
| EQ | Equation du temps | Equation of time | |
| FUS | Fuseau horaire | Dual time zone | |
| HG | Heure à guichet | Hour shown via an aperture | |
| HS | Heure sautante | Jumping hours | |
| HU | Heure universelle | World time | |
| IRM | Indicateur de Réserve de Marche | Power reserve indicator | |
| J | Jour | Day indicator | |
| LU | Phases de lune | Moonphase | |
| PS | Petite seconde | Small seconds | |
| Q | Quantième perpétuel | Perpetual calendar | |
| QA | Quantième annuel | Annual calendar | |
| QR | Quantième perpétuel rétrograde | Perpetual calendar with retrograde date hand | |
| R | Répétition minutes | Minute repeater | |
| REG | Affichage de Type Régulateur | Regulator-style display | |
| S | Seconde au centre | Center sweep second hand | |
| SE | Semaine | Week indicator | |
| SQU | Squelette | Skeleton | |
| SID | Heure sidérale | Sidereal time | |
| TO | Tourbillon | Tourbillon |
