An H1B1 visa (sub-classification) is a temporary work visa specifically for citizens of Chile and Singapore with a job offer in a specialty occupation in the US. The Chile & Singapore Free Trade Agreement requires the USCIS to exempt 6,800 H1B visas from the H1B visa cap and be reserved for eligible citizens of Chile and Singapore.
Other foreign nationals with a job offer in a specialty occupation in the US may be eligible to apply for an H1B visa.