lb is the ISO 639 language code for Luxembourgish; Letzeburgesch.
Standard
ISO 639-1
Code
lb
Language
Luxembourgish; Letzeburgesch
ISO 639-2
ltz
About this code
lb is the code for Luxembourgish; Letzeburgesch under ISO 639, the standard used to tag languages in web pages, software locales and library records. Its three-letter ISO 639-2 form is ltz.