Floor numbering in Avalor

Traditional "moon", European and North American schemes of floor numbering are in use in Avalor. Avalor City recommends the use of abbreviations based on the English words for types of floors or the use of negative and positive numbers (-1, 0, 1, etc.) for maximum clarity in Spanish and Swedish, but also allows the use of native language abbreviations outside of Avalor City. The "moon" system is the traditional Avalor system and it uses only positive numbers, where the "first" floor is the lowest floor, whether it is habitable or unhabitable.

"Moon" scheme
This is the oldest floor numbering scheme in Avalor. It dates back to the Yogana Storeys of Buildings Book from 895 AD and is written in Yogana, an indigenous language of Avalor. It spread to other indigenous languages of Avalor from the 900s to the 1300s.

Yogana lacked any equivalents to the English word "storey", so jön˚cer [tɬʊːntsaɚ], literally meaning "moon" in Yogana, was used (Letter ˚c, and its capital form, ℃, represented [ts] in Yogana).

The moon scheme does not use any negative numbers to indicate floors below ground. Instead, the "first" floor is the lowest floor of the building, whether it is at ground or underground.

This scheme is mostly replaced by both European and North American schemes, but it still retains usage in some western parts of Avalor, notably the city of Nolanas.

European scheme
In this scheme, the "first storey" or "first floor" is the level above ground level. The floor at ground level is usually called "0", "G" in the Avalor Bilingual Area, "PB" or "P" in Spanish-speaking areas outside of Avalor Bilingual Area and "E" or "BV" in Swedish-speaking areas outside of Avalor Bilingual Area.

North American scheme
In this scheme, the "first" floor is the floor at the ground level and the floor above it is the "second" floor. On some buildings, floors below ground floor are usually marked as basement (B) but some buildings also marked these floors as minus (-), for example; minus one (-1), minus two (-2) and so on. In few cases, the floors below ground floor are marked as lower ground (LG) or sub basement (SB) though this is uncommon.

Comparisons of non-numeric floor numberings in different parts of Avalor

 * ABA: Floor ID in the Avalor Bilingual Area
 * ES: Floor ID in Spanish-speaking areas
 * SV: Floor ID in Swedish-speaking areas