Bing found the following results
Creating a Healthier Future | H1
<h1>–<h6>: The HTML Section Heading elements - MDN Web Docs
About Us | H1
HTML h1 to h6 tag - W3Schools
H1 Inc. - Wikipedia
H1 Visa: Everything You Need to Know - UpCounsel
H1N1 Influenza - StatPearls - NCBI Bookshelf - National Center for ...
Healthcare Data Platform | H1
H1 | LinkedIn
What Is an H1 Tag? Why It Matters & Best Practices for SEO