请那位大拿帮忙解释维基百科这几句话

Chromosomes are linear arrangements of condensed deoxyribonucleic acid (DNA) and histone proteins, which forms a complex called chromatin.^[2] Homologous chromosomes are made up of chromosome pairs of approximately the same length, centromere position, and staining pattern, for genes with the same corresponding L.

https://en.wikipedia.org/wiki/Homologous_chromosome?

请问L是什么？