The following abbreviations are used for languages, dialects and reconstructed proto-languages:
- Du = Dutch
- Engl = English
- Far = Faroese
- Germ = German
- Goth = Gothic
- Icel = Icelandic
- EnF = Forest Enets
- EnT = Tundra Enets
- Est = Estonian
- Fin = Finnish
- Hung = Hungarian
- Kam = Kamas
- KhIrt = Irtysh Khanty
- KhKaz = Kazym Khanty
- KhNi = Nizjam Khanty
- KhO = Obdorsk Khanty
- KhSur = Surgut Khanty
- KhV = Vakh Khanty
- KhVj = Vasjugan Khanty
- KomiJ = Jazva Komi
- Latv = Latvian
- Lith = Lithuanian
- Liv = Livonian
- MariE = East (Meadow) Mari
- MariNw = Northwest Mari
- MariW = West (Hill) Mari
- Mat = Mator
- MdE = Erzya Mordvin
- MdM = Moksha Mordvin
- MDu = Middle Dutch
- MHGerm = Middle High German
- MSax = Middle Saxon
- MsP = Pelymka Mansi
- MsNV = North Vagilsk Mansi
- MsSV = South Vagilsk MAnsi
- MsLL = Lower Lozva Mansi
- MsN = North (Upper Lozva and Sosva) Mansi
- MsT = Tavda (South) Mansi
- MsLK = Lower Konda Mansi
- MsUK = Upper and Mid Konda Mansi
- NenF = Forest Nenets
- NenT = Tundra Nenets
- Ngan = Nganasan
- Nw = Norwegian
- OEngl = Old English
- OCSlav = Old Church Slavonic
- OHGerm = Old High German
- Ol = Olonetsian
- ONo = Old Norse
- OSax = Old Saxon
- OSw = Old Swedish
- PBalt = Proto-Baltic
- PFi = Proto-Finnic
- PGerm = Proto-Germanic
- PIE = Proto-Indo-European
- PKh = Proto-Khanty
- PMari = Proto-Mari
- PMd = Proto-Mordvin
- PMs = Proto-Mansi
- PNo = Proto-Norse (Proto-North-Germanic)
- PPerm = Proto-Permic
- PSaa = Proto-Saami
- PSam = Proto-Samoyed
- PSlav = Proto-Slavic
- PSlk = Proto-Selkup
- PU = Proto-Uralic
- SaaA = Aanaar Saami
- SaaK = Kildin Saami
- SaaN = North Saami
- SaaP = Pite Saami
- SaaL = Lule Saami
- SaaS = South Saami
- SaaSk = Skolt Saami
- SaaT = Ter Saami
- SaaU = Ume Saami
- SlkK = Ket Selkup
- SlkO = Ob Selkup
- SlkTa = Taz Selkup
- SlkTy = Tym Selkup
- Udm = Udmurt
- UdmB = Besermyan Udmurt