Site ID
Also: siteId, MLA, MLM
Mercado Libre's identifier for one of its national marketplaces, such as MLA for Argentina, MLM for Mexico or MLV for Venezuela.
The site ID decides far more than a domain name: marketplace depth ranges from 6,372 results for one query in Mexico to 26 in Panama, and nine of the seventeen have catalog product pages and installments while the rest have neither.