Bing found the following results
576i - Wikipedia
Standard-definition television - Wikipedia
576i - Simple English Wikipedia, the free encyclopedia
480i - Wikipedia
Difference between SDI signals: HD-SDI, 3G-SDI, 6G-SDI, 12G-SDI …
PAR, SAR, and DAR: Making Sense of Standard Definition (SD) …
Composite Video Connections Explained - Lifewire
576i
Definition of 576i | PCMag
About: 576i - DBpedia Association