Indeclinable nouns in Latvian are loaned from other languages. Most of them are recognized by their endings: -ā, -ē, -o, -u, -ū. But there are nouns (mostly proper nouns) which has endings of declinable noun and which are indeclinable.
ampluā
ateljē
kino
ragū
gnu
čačača
kanoe
asorti